Baby got back. No, we're not talking a killer ba-donk-a-donk; we're talking stud backers. Premium, heat-treated aluminum stud backers. We made these double backers over 2-1/2" wide, for the riders who want to run a tight double row of studs up the center of their track. These 0.180" thick backers are the perfect weight and profile for Fat Head™ Studs. The premium aluminum alloy construction resists wear, tear and corrosion, and of course, we've got your back with a two-year replacement warranty.