Prometheus Hop Up Tensioner w/ Soft & Hard, flat type

A very innovative Hop-Up rubber buffer knub.
Designed for low stress and high performance.

-Featuring the bridge type Hop-Up buffer knub.
-Enhance BB flight in a long and straight line, with wider contact point to stabilize the BB.
-Super hop up effect.
2 pcs included (hard and soft)

Can use in any brands of hop up rubber packing