Poly- V Belt pulleys are manufactured from cast iron and are black phosphated according to ISO9982 norms. All pulleys are statically balanced for peripheral speeds up to 35 m/sec.
Poly-V Belt part numbers are identified by 3 numbers (e.g. 100) which represents the pitch circle diameter, a letter (e.g. L) the pulleys pitch/ belt cross section and a 2 digit number (e.g. 12) the number of grooves, for example 100L12.