The tapes are thicker than normal tape and have a raised textured surface.  For me the black seems more tacky than the white. The black is similar plastic/rubbery material as standard black tape, but the thickness and texture makes the tape softer and a lot more tacky than the white.  I know Vise makes some similar rubber thumb tapes but I believe they are a bit more expensive.   I have issues to where I need to use a snug thumb hole so I don't lose the ball off my hand too quickly.  (I've tried other pitches and I can't clear the ball-Long Thumb/Tacky Skin)  I have found that this tape allows me to use a slightly looser thumb hole and still have a better grip than with a snugger fit with regular tape.  If your span and pitches are right and you still have problems gripping and staying in the ball, give this tape a try.

https://www.youtube.com/watch?v=IFhdo64VDmA

http://www.bowling.com/products/master-insert-tape-1--white-super-textured-12-pk-.htm

http://www.bowlingindex.com/store/merchant.mvc?Screen=PROD&Store_Code=BI&Category_Code=IT&Product_Code=FG-AC-242SDZ