Gear Belts for FR-900 FR-750, FR-770, FR-1000I,FR-1000II,FR-1000III band sealing mechanical device Size Optional: (Perimeter x width)410mm(Perimeter)MM x 5mm(width)420(Perimeter)MM x 5mm(width)428(Perimeter)MM x 5mm(width)598(Perimeter)MM x 5mm(width)(the 598 teeth is outside)600(Perimeter)MM x 5mm(width)630(Perimeter)MM x 5mm(width)Packing included: 20pcs equipment belts Note: Please fold the original equipment belt to measure the size, if the folding lenth is 205mm, you then deserve to desire 410mm.please ensure it is the appropriate length you ought to order.