Gravity RC two stage tire file
Gravity RC’s light weight tire file is designed for normal rubber and foam tire sanding purposes. One side of the high grade woven carbon fiber handle is covered in 80 grit carbide abrasion for harder foam and nitro front rubber, the other side is covered in 150grit for softer rubbers and for the desired smooth finished surface of the tires. The file comes packaged in a hand sewn fabric carrying sleeve.
Source: Gravity RC [teamgravityrc.com]