It is made of cheap marital. The sound quality on these is truly outstanding. I’m 54 I bout broke my neck in them their an inch off the ground and it would cause me to twist my foot sideways as I walked. These darling princess flip flops are awesome! It also worked great on the frame. This is an excellent reference for anyone interested in ayurveda100% would recommend I really like the feel and fit of the cincher, especially the back support. In fact to keep a proper peddling position, I had to grind the circumference of the shock absorber screw down, so it would fit within the mounting hole of the carrier. At medium volume I get close to 90 hours. Excellent wire, 4 stars, rack-em.