Found them on Ali :
https://a.aliexpress.com/_d76o0r4
Did some digging and it seems they are new outemu silent designed by hbheroinbob from reddit.
Anyone tried them ?
5 Likes
This is where you should go first, to learn about these:
Youâre actually asking about two things: the U4 stems, and the Boba switches. The OUTEMU tactile enthusiast lineup is supposed to be modular, so the idea of a new âswitchâ is just a convenience.
I donât know what itâs going be called, exactly, but âEuphoriaâ is one possibility, based on the U4 stem. But itâs two new modular components we are talking about.
âBobaâ housing
These are improved housings for the OUTEMU enthusiast linear and tactile stems.
In short, they are said to be smooth housings with greater tactility than previous housings, and reduced ping.
They are being used as the basis for the U4 stem being in a complete, marketable switch.
Much-needed, IMHO. The OUTEMU Sky tactile housings had some good characteristics, but they didnât always fit well in plates, and there was something about the tactile leaf that caused almost unavoidable ping, unless you took specific measures. If these Boba housings have eliminated that problem, they could replace Sky housings for many use cases.
âU4â stem
This is a new OUTEMU Silent Tactile stem that came out recently.
It is supposed to resemble the large, round tactility that is in style presently. In contrast to the previous Silent Tactile stem in the Silent Forest switch, which has a âPâ tactility [bump right at top], this has a âDâ tactility [large round bump occupies most of the keypress.]
I guess broadly-speaking it might be comparable to a Zilent or silent T1, but it has its own unique feel.
Maybe youâve already read about the above information. Itâs user feedback thatâs key. Itâs been positive, some people say they donât need lube. What Iâm curious about is how the Boba housings take other stems besides U4.
I am slated to receive some of these for testing. I have been going through a lot of tactiles recently.
12 Likes
6 Likes
Wowee, they sound nice 
I caved in and ordered some of aliexpress, too bad the 55g ones are not available there
1 Like
Yeah. 55 gr didnât seem to be available to international customers in the samples release.
If the 62 gr are heavier-than-expected, I will spring-swap with 60 gr or 58 gr springs. Maybe finally have a use for those 55 gr Spirits I have lying around.
I have slowly went towards even lighter like 45gâŚdo you think they should work with 45g springs, and lubed everywhere including the bump ?
That I could not tell you ⌠yet.
I know that 55 gr works because numerous people have said so. I have some 45 gr springs, so maybe I can try it.
1 Like
Heya, have you tried the 45g by chance? Thanks
Soon ⌠Soon
My U4s had to make a few loops around Los Angeles before they departed for Canada, but I think they are arriving on Monday.
3 Likes
I can sympathize, I got 140 top & bottom boba housings on the way Iâm getting kinda antsy about getting.
1 Like
Yeah, theyâre a very viable candidate for a full-size build Iâm thinking about [I ordered 120]. So Iâm going to test several spring weights and stems, and still have enough left over.
[I ordered 62 gr, but might have gone for 55 gr if available. However, in my experience with the previous Silent Sky stems, 55 gr worked but felt anemic. But Iâll try 55 gr anyway.]
2 Likes
Currently building out my U4 Gazzewâs using his boba bottoms and pink tops, paired with Sprit 63.5 complex springs (105 on springs, doughnut lubed with 3204; stems w/ 3204, no legs), I dare say, theyâre much smoother than my Zilents and definitely some quiet boys
8 Likes
This is sounding realllll good. I already have 63.5 gr Spirits, but theyâre the regular stainless kind.
Can you tell me whatâs the advantage of complex springs? GBoards recently restocked, so could easily get them.
2 Likes
This is something Iâve been wondering also since I found out about them, my understanding so far is progressive = lighter at top & actuation than the standard weighting, slow = smaller difference between actuation & bottom out force compared to standard weighting, complex = ???
3 Likes
Found this on Spiritâs website, shows the force curves of the different springs types at Iâm assuming the same weighting.
3 Likes
Havenât put the Bobas in a board yet, but got mine and can confirm they are quieter and less crunchy than say an Outemu Silent Sky or Aliaz.
The tactile event feels very short. I was expecting a rounder, longer tactile action.
Need to put into a board for further assessment.
3 Likes
I have some prototype U4 stems and I can tell you the bump feel depends heavily on the leaves theyâre paired with. Havenât tried the Boba housings yet (any day now!) but earlier the versions I have pair well with Pandas.
1 Like
Oh boy the hype is building
i have these in a board now and itâs great. slightly deeper tone than aliaz, and i feel like tactility is within the realm of dropâs HPs. it came with some custom PTFE blend or something (labeled #6) that was meant for doing the spring donut dips. i didnât add any other lube. canât tell if itâs scratchy or not. itâs kind of hidden behind the tactility.
overall, pretty happy with them. itâs kind of funny but I would describe my personal experience with these switches as a nostalgic recollection of how topre feels in my memory, but not how they actually feel whenever i go back to the hhkb.
5 Likes