1355J7 (533J7) Poly V Belt, J Section With 7 Ribs – 1355mm/53.3″ Length. Poly V-Belts combine high flexibility and the lightweight of flat belts with the grip of V-Belts, this creates a high power rated special rib profile. Poly V-Belts are endless rubber with V shaped grooves and polyester cord running the length of the belt. They have a good resistance to mineral oils and can work in temperatures from -30°C to +60°C(+80°C for short periods) and are also suitable for environments of high humidity. J section micro V-Belts have a pitch of 2.34mm and an overall height of 4.00mm.