Measure your brake drum before ordering. The 4" bands are used on Yerf Dog, Kartco, Road Boss, ThunderKarts, Ken-Bar and many other brands with 4-3/16" brake drums. The 5" brake bands are used on Carter Brothers Go Karts with 4-3/4" drums. Loop diameter .375 / .125 slot. These 6" Comet Bands, Part #VIN0941 will NOT work on Yerf Dog Go Karts with a 6" drum.