Tumble dryer belts often slip or snap, due to wear and tear so the only real solution is to buy a new replacement. The Poly-V Belt, or Ribbed Belt as it is also known, resembles a flat belt but with V-shaped ribs along the inside surface for increased friction force between the pulley and the belt. This replacement belt could help ensure the drum in your tumble dryer is rotated correctly, to ensure that your clothes are dry and do not come out damp at the end of the cycle. If the belt has failed in your tumble dryer, ensure its smooth operation once more with this replacement.