Hop packing is made of silicone, which retains its properties also at low temperatures, since they do not hardening, as in the case of rubber.
Hop-Up Packing - reviews
Number of reviews: 4 Average rating: 5.00
Very nice bucking. Ive flathopped mine. Its relativly soft, so it seals nice.
great rubber, do his job.
a nice and effective rubber. you have to be careful when installing it or swapping inner barrels. it tears really easy.
This is one of the best hop-up rubber ever made. Excellent results on replicas until 350-380fps