Everything you need to create two DJI Mecanum Wheels for RoboMaster S1 is included. You can also use the parts to repair your existing wheels. The 24 rollers are made from a two-shot injection molding process and feature a combination of hard and soft rubber materials. The hard rubber is made from high-strength, impact-resistant, and self-lubricating POM, while the soft rubber is made from wear-resistant TPU. Together they work to give the S1 durable wheels with advanced traction.