2-Tires The product is a 26” x 4” CST BFT bicycle fat tire designed for e-bikes. It is a black tubular tire made of rubber with a studded design.2-Tire’s and is lightweight at 3.4 lbs. This fat tire is suitable for universal bike types and is recommended for its quality and performance. The manufacturer does not offer a warranty for this product, but it is a reliable choice for anyone looking to upgrade their bicycle with a durable and high-performing tire.