Scuba Choice Palantic Technical Diving Stainless Steel Backplate with Harness System and Crotch Strap Back plate size: 15-3/4" x 10", thickness: 3mm 2" Nylon webbing, 5 Stainless Steel D-rings and 1 stainless steel buckle Material: Stainles Steel Harness system & Crotch strap with Stainless Steel buckle and D-Rings