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The 1/12th rear wheel adaptors snap into the outside of the rear wheel and are easily removed.
The rear wheel adaptors add firmness to the outside of the wheel for more rotation.
They come 3 pairs to a package and offered in soft or medium firmness.
1/12 Rear Wheel Adaptor Medium (Clear) No.ULT12R-6-RAM
1/12 Rear Wheel Adaptor Soft (Black) No. ULT12R-6-RAS