Material: rubber tyre. 4Pcs RC Tires. Hex: 12 mm. Update solid wheel rim has made more durable. Wheel rim material: ABS. Increase the wheel tire greater stability. The width of the tire: 30 mm. New 144cm/56.6in OEM 4130-711-3210 Flex Drive Shaft For Stihl FS50 FS55 FS55R.