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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 RSR 5-Spoke (Porsche) inserts for 15mm wheels. These fit 15mm insert wheels from several manufacturers including C.B. Design, Slot.it, etc... Package of four (4) inserts.