Upgrade your 1/10 RC crawler with 1.9 crawler tire foam for improved traction and grip. Suitable for 1/10 RC crawlers using 1.9 tires, such as TRX4 SCX10 III. This 1.9 tire foam is made of silicone material with a three-layer hollow design. Remove part of the lining for a softer feel or keep it intact for a firmer performance. The silicone 1.9 tire foam replaces traditional absorbent sponge foam lining. It is water-resistant and provides superior sidewall support to help maintain tire shape, enhancing traction and grip. Measuring 108x42mm (4.25x1.65in), each piece weighs 82g84g. Choose between two silicone densities: purple and green (soft), suitable for 18lbs and 12lbs 1/10 RC crawlers respectively. Color: Green and Purple Material: Silicone Package Contents: 4 pcs silicone 1.9 tire foam for RC car Note: Light reflection and display differences may cause slight variations in color. Measurement allowance is +/- 13cm.