Belts may dry out and tear over a long period of time, and worn belts will slip and be dangerous, so they need to be replaced in time. 2Pcs 135J Planer Drive Belt for Metabo DH330 7233712030. The belt is soft, the toughness is better, the accuracy is more accurate, and the elasticity is better. Perfect as a replacement belt or backup belt. Made out of a fiberglass reinforced rubber which means it’s chemically resistant, harder wearing and doesn’t stretch whilst under stress. Made of rubber material,oil and heat resistant,Excellent flexibility and resistance to lateral pressure,smooth transmission,excellent flex, long service life.