18 Ga./43 mil. Heavy Gauge Steel Track, 3-5/8 in. Lightweight steel track is an easy to install, non-combustible, high quality alternative to traditional 2x4 wood stud framing. Application: Non load bearing walls and ceilings. Benefits: Environmentally friendly. Won't shrink, swell, split or warp (which reduce fastener pops). Easy to cut with tin snips. No sawdust for easy cleanup. Termites/Rodents won't interfere with structural integrity.