Metzeler tubes are made of all natural rubber instead of butyl which enables the tube to be more resistant to punctures, tears and abrasions. When changing a tube type tire, make sure you also change out the inner tube. A fresh, correct inner tube will add life and reliability to any new set of tires. Give Midwest Traction a call at 1-855-681-8326 and let us help you in not only selecting the correct tires but also the correct inner tubes for your machine.