Yellow: super Soft, suit for 3-5lb RC Crawlers, green: soft, suit for 3-5lb RC Crawlers, blue: medium, suit for 6-10lb RC Crawlers, red: hard, suit for more than 15lb RC Crawlers.
Made of silicone rubber materials, waterproof and temperature resistant.
More superb sidewall support than regular foam to keep the shape of tires.
It improves traction and grip to help your rig to out of tough situations.
Each Weight: 69g (Yellow), 70g (Green), 73g (Blue), 76g (Red).
