This is a drop-in nub set designed for almost all the Tokyo Marui spec hop-up units to provide your replica with a very easy hop modification.  It can be installed in four different directions and comes with two different hardness; 70 deg for the blue one and 80 deg for the red one.  It will greatly help to increase accuracy and range of your weapon.

Features:

• A set of two H-Nub spacers
• 2 hardness options included in the set
• Made of aerospace silicon
• Easy to modify
• Can be installed in four different directions
• Compatible with Marui standard parts