H-shape hop-up spacer, 2 sizes in packing
Instead of the standard tube-style bucking, this 'H' shaped bucking replament forces the hop rubber into a more natural cup around the BB. So instead of the hop rubber just gripping the top edge of the BB, the 'H' packing will grip a much larger surface area and therefore offer more spin and finer adjustment.
Made of POM (polyacetal). The package contains 2 pcs - larger and smaller.