These silicone rubber tire foam inserts are designed for 1.55" RC crawler tires with a diameter of 95–97mm. Made from durable silicone rubber, they are waterproof and temperature resistant, delivering stable and consistent performance in off-road crawling conditions. The hollow internal structure provides enhanced sidewall support compared to traditional foam inserts, helping tires maintain proper shape under load while improving ground contact and traction on uneven terrain. Different hardness options allow RC hobbyists to fine-tune tire response based on terrain and driving preference, making these inserts suitable for a wide range of crawling setups.