Proven performance, excellent range and superior accuracy, use a Prometheus Air Seal Hard Hop-Up Rubber in every build for an instant performance boost. This hop-up rubber was specially developed for all rifles that have a shooting power of over 0.9 joules to approx. 1.4 joules.

The superior quality and tolerances of Prometheus Hop-Up Rubber provide increased range, accuracy and precision while creating the perfect air seal with excellent resistance to oil and wear. The material also prevents misfeeds and can lift a variety of BB weights and types. Perfect for Tokyo Marui AEGs and available in two levels of hardness, red (hard) and purple (soft).