These 1.9 silicone tire inserts are designed for 1/10 RC crawler tires. Made from durable silicone rubber with a softness rating of 45–50A, they provide balanced tire support while maintaining good flexibility. Compared with traditional foam inserts, silicone inserts are waterproof and will not absorb water, making them suitable for crawling in wet environments such as mud, sand, or shallow water. The insert size is 108 × 42 mm with an inner diameter of 28 mm, fitting most standard 1.9 inch RC crawler tires. If necessary, the inserts can be trimmed to fit narrower tires. Package includes 4 silicone tire inserts.