NOTE:This product is suitable for most chains, but it may not be compatible with some narrow chains on high count cassettes (eg KMC X9.99 Chain, thanks to Glen Miller for his help and look forward to more suggestions and opinions),and we will develop a new type of jockey wheel suitable for that narrow chains brand:stylrTop Bearings: Upgraded RS bearing Type: 11T Material: Aluminum alloy Color: Black,Blue,Gold,Red Package weight: 0.052 kg Product size (L x W x H): 4.30 x 4.30 x 0.60 cm / 1.69 x 1.69 x 0.24 inches Package size (L x W x H): 6.50 x 4.50 x 1.00 cm / 2.56 x 1.77 x 0.39 inches Package Contents: 2 x Wheel Rear Derailleur Pulley, 4 x Accessory

Stainless steel bearing for ultra durability. Material: Aluminum alloy. Fits for almost all mountain bike jockey wheel of 11T. Compatible:SHIMANO & SRAM. Anodised CNC machined bicycle jockey wheel with fully sealed bearing for center bolt derailleurs.

Case Material: Aluminum. Auto Part Position: Rear. Material: Aluminum. Color: Blue. Brand: Stylrtop. Date First Available: July 8, 2016. Best Sellers Rank: #42,368 in Sports & Outdoors. Customer Reviews: 4.4 out of 5 stars 1,332 ratings 4.4 out of 5 stars. : B01F5P9SCA. Part Number: ?CTCB170269001. Manufacturer: ?Stylrtop. Number of Items: ?6. Material: ?Aluminum. Color: ?Blue. Country of Origin: ?China. Brand Name: ?Stylrtop. Package Weight: ?0.02 Kilograms. Item Package Dimensions L x W x H: ?5 x 4 x 0.4 inches.