Atom Custom Impact cylinder heads are made of aluminium using CNC technology. Impact cylinder heads include pre-installed Sorbothane® shock absorbing material. Sorbothane® shock absorbing material prevents breakage of the gearbox thanks to its excellent dumping properties. Atom Custom Impact cylinder head also fixes the AOE (Angle of Engagement) of the piston in relation to the sector gear. Note that after adjusting the AOE with the Impact cylinder head also the piston must be compatible with the new AOE. We recommend using Atom Custom Fusion piston with these Impact cylinder heads to ensure the compatibility.