This is a great product for double bass players who are looking for a durable and reliable endpin. The main materials of this endpin are carbon fiber, metal rod, and rubber. Lightweight and sturdy, with excellent wear resistance. It is also very durable, so it can withstand the rigors of playing and practice. The endpin is 3/4 size, which is the standard size for most double basses. It is easy to install and use, and it will help to improve your playing technique and posture. The endpin is also a great addition to any bass player's accessories collection, and it will help to keep your instrument in good condition