Product Details  1 SPZ, SPA, SPB, SPC Belt pulley  2 Made of superior cast iron GG25  3 Dynamically balanced  4 ISO9001-2000 Certificed  We are a leading manafacturer of V Belt Pulley in China and ISO 9001 certificated. SPZ, SPA, SPB, SPC Vee Belt Pulley (Europe Standard): Bore: Polit Bore pulley, Taper bore pulley Material: Cast Iron GG25 Surface treatment: Black Oxide, phosphating finished, powder coating etc.  Each pulley is strictly dynamically balanced with high precision dynamic machining tools. Unbalanced volume will corrected accurated.  90% of our products are exported to West Europe and North American market. We guarantee quality products under the most competitive price in China. Any request for quote will be appreciated and answered immediately.