Product Description The - Made in one piece The OPI SpideRing Si chainring set in an eye-catching 10-arm design is 3D forged from a single piece of aluminium, scores with low weight and enables highly-precise shifting when road cycling. Specifications:Application:RoadAttachment:FSA Direct MountTeeth:34-50 t, 36-52 t, 39-53 tTechnical Information:Material:AluminiumFeatures:one-piece 3D forged with OPI technologyprecise shiftingeye-catching designlight, durable and stiffTechnology:OPI One Piece Integration (OPI) refers to a 3D forging technology that makes it possible to produce components from one part in several steps, which are traditionally made up of several parts joined together. Manufacturer Numbers:34-50 tooth:KP245/36-52 tooth:CU4042SI5239-53 tooth:KP244/Contents:1 x Weight: black | 34-50 tooth: 160 g Manufacturer: Cycling Sports Group Europe B.V. Geeresteinselaan 57 3931 Woudenberg Netherlands info@cyclingsportsgroup.com