These are medium-diameter, black, low-friction propeller tires. Includes carbon fin wheels. Approximately 24mm in diameter. The wheels have been pierced with a 1.8mm drill using a wheel piercer. The tires have been made into propeller tires using a propeller cutter. It is recommended to adhere them with double-sided tape or similar during running. Rim cutting may be necessary depending on the tire diameter. The size may vary depending on the calipers and the amount of force applied. Please refrain from purchasing if you are looking for a perfect product. Shipping will be via Yu-Packet Post Mini.