A very innovative Hop-Up rubber packing, designed for low stress and high performance. -Featuring the zero inner hump.( no hump inside just plane rubber chamber packing ) -Enhance BB flight in long and straight path. -Super hop up effect, very effective even with heavy gram BBs. This hop up rubber designed to be paired with the hop buffer bridge (product code: PR-4560329179192) and prometheus 6.03 inner barrel, great for all fps set up, especially, 400fps and above.
