GBB Hop up rubber are design by maple leaf which efficiency the distence of shooting, the range from 50 degree upto 80 degree. each different degree we use different color to distinguish.
The material of GBB rubber using the cold resistence rubber to produce which enable for AEG to operate normal in cold weather .
inside the GBB rubber the friction point design is diamond shape, which give more better fricition when BB delivery out of barrel.