Psionic's "Matrix-X" drop-in bucking mimics how R-hop works! Created thanks to a new production system developed by us, with a urethane compound resistant to low temperatures! It is designed for use with any light or heavy weight starting from 0.20g and for powers between 0.8J and 2J! Best configuration 1: Psionic concave pressers + 0.25gr / 0.28gr Best configuration 2: Camera hop up Retroarms + Airtech Trolley + 0.25gr / 0.28gr The urethane 70Shore are comparable, in terms of use, to a silicone 60Shore thanks to its elastic modulus! What do you buy: 1 pc 70shoreA "Matrix-X" drop in rubber with proprietary R-hop-like hump - type 1 lip for narrow hop chambers (ics) 1 pc 70shoreA "Matrix-X" drop in rubber with proprietary R-hop-like hump - type 2 lip for large hop chambers