1. The tire liner is made of silicone rubber material, which is waterproof and high temperature . 2. With its improved traction and grip of the tires, it can help your RC car get out of trouble on complex terrain. 3. Three-layer hollow design, providing a variety of soft and hard options. (Users can cut off part of the padding or insert foam strips to achieve different softness and hardness, which can be adjusted as needed.) 4. Compared to traditional foam liners, this silicone rubber liner provides more support on the sidewalls, helping to maintain the shape of the tire so it fits the road better. 5. Enhance the stability of the RC car. Insert:Hard about 8KG RC crawler Colour:C:Blue Material:Silica gel Size:108x42mm Package Contents: 4 x RC Car Silicone Tire Inserts Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.