This set of double H hop-up nubs raises your gun's bucking contact with BBs for better accuracy and range.  It requires no modifications at all to the hop-up arm and can be installed in four directions depending on what kinds of BB’s trajectory you are looking for.

Specifications:

• Comes in a set of two
• Two hardness options included in the set (Blue: 70 deg / Red: 80 deg)
• Material: Aircraft silicone
• Compatibility: Marui spec products