Packed 50 to a set, these brown PTFE Teflon belts are conveyor sealing belts for the FRB-770 band sealer. The thin brown endless loops are bundled together and tied with yellow ties at top and bottom. They carry bags through the heating and cooling blocks of the FRB-770 during continuous sealing, and the heat-resistant PTFE material and large quantity make the set a stock spare for workshops and packing lines.