The BOYESEN high-performance membrane made from DURA-FLEX fiber material features a two-phase system. Two membrane petals work together to enhance ride comfort and reliability, providing better control, increased performance especially at low RPMs, improved throttle response, proven thousands of times!! This membrane is ideal for those looking to upgrade their Yamaha motorcycle's engine performance. Its DURA-FLEX material ensures longevity and resistance to wear, ensuring that your bike maintains peak performance under various riding conditions. Experience unmatched reliability and enhanced control with this top-notch power membrane.