You can use any pair of inserts to emulate the vacu gips. It's really the drilling technique that creates the effect, not the grip.
Fingers swell and contract on a daily basis just like other parts of the body (hey, no x-rated jokes, ok?). The vacu grips were developed to give the fingers the same feel regardless of swelling or contraction and they do this quite well.
I tried them earlier this year but they felt too mushy for my release style. There are though many people that really like them.
Check out Brunsnicks video for a quick tutorial:
http://www.brunsnick.com/vacu.htmlEdited on 12/7/2006 5:15 PM