Oregon 91VG100U Roll of Chamfer Chisel XtraGuard Chain 100-Feet Long 3/8-inch pitch .050-inch Gauge Special shaped low-vibration heels offer outstanding performance along with durability and easy maintenance Ramp-shaped depth gauges help reduce kickback without affecting performance Vibe-Ban chassis design reduces vibration 25 percent or more at the chainsaw's handles LubriLink tie straps help keep oil where it's needed- on the chain LubriWell oil holes help carry oil around the full length of the guide bar's groove