This 20-piece pack of brown PTFE Teflon belts fits the FR-900 continuous band sealer. Each belt is a thin brown endless loop, and the set comes gathered into one bundle. The belts act as the sealing and conveyor belts that carry the bag through the heated section of the machine, and the larger pack count suits users who run FR-900 sealers regularly and replace belts often as part of routine upkeep.