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Note: The OD of these inserts is approximately 12.32mm. This is the inside diameter (ID) of the insert wheels these inserts are designed for. Note the product photo is a CAD rendering. The actual insert color is usually black but may vary (no choice).
CG Slotcars Roadster inserts for 15mm wheels. These fit 15mm insert wheels from several manufacturers including C.B. Design, Slot.it, etc... Package of four (4) inserts.