... quality, reasonable price 3. No noise, high efficiency NOVO's Sprocket chain:1. Material: Aluminium, Cast Iron, Steel.2. Surface Treatment ... .Specifications1.high quality and most competitive in European market 2.Sprocket, non-standard or standard ,OEM availableWhat we have: Our factory ... good qualityCertification:We've been ISO9001:2000 certified since 2003. Sprocket Chain/ Sprocket gear