xxxJ12 The first 2 or 3 digits of the part nubmer is the belt length 180J12 is 18" Long Belts. The numbers after the J are the number of ribs along the belt width. 180J12 belt has 12 ribs

12PJ1016 Poly-V 12 Rib Belt Black Rubber

12PJ1016 Poly-V Belt

12PJ1016 Poly-V 12 Rib Belt Black Rubber Neoprene

  • Price: $21.95

200J12 Poly-V 12 Rib Belt Black Rubber 12PJ508

200J12 Poly-V Belt

200J12 Poly-V 12 Rib Belt Black Rubber Neoprene 20" Long

  • Price: $16.10

300J12 Poly-V 12 Rib Belt Black Rubber

300J12 Poly-V Belt

300J12 Poly-V 12 Rib Belt Black Rubber Neoprene 30" Long

  • Price: $17.10

320J12 Poly-V 12 Rib Belt Black Rubber

320J12 Poly-V Belt

320J12 Poly-V 12 Rib Belt Black Rubber Neoprene 32" Long

  • Price: $17.95

505J12 Poly-V 12 Rib Belt Black Rubber

505J12 Poly-V Belt

505J12 Poly-V 12 Rib Belt Black Rubber Neoprene

  • Price: $17.95