Dimensions for use with aluminum wheels. Size may vary. Please secure with double-sided tape or similar before driving. This is a modified product of a Tamiya genuine part. Shipping will be via Yu-Packet Post Mini. Posting will only be on Sundays and Wednesdays. Same-day posting is not possible. Please refrain from purchasing if you are in a hurry. Tracking number updates may be delayed by one day due to postal drop-off. This is a handmade product, so please refrain from purchasing if you are sensitive to imperfections. Thank you.