Specifications: It is made of good quality material, durable to use. The chain guide features with simple and elegant appearance, bright colors. ISCG03 and ISCG05 can be installed without removing the chainring. Item Name: Chain Guide Material: Aluminum Alloy, Nylon Support Specifications: ISCG 03, ISCG 05, Threaded BB Bottom Bracket (Press-in Type is Not Currently Supported) Support Range: 30-40T Round Disc, 30-38T Oval Disc Attributes: Type A: ISCG 03, Type B: ISCG 05, Type C: BB Features: Durable, Stable, Useful Size: 8.5cm x 6.5cm x 2cm/3.35" x 2.56" x 0.79" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: Type B: 1 x ISCG 05 Chain Guide, 1 x Screw, 2 x Stainless Steel Gasket