Snow chains made of case-hardened alloy steel on a spring steel hoop are easy to mount and dismount. Check local regulations prior to use. Ask your authorized Audi Dealer about compatibility with your vehicle and wheels. Self-tensioning system. 1 set = 2 pieces. European model shown. Diamond pattern snow chains made of stainless steel (manganese nickel alloy) with micro adjustment- stationary fitting- steel-edged links- asymmetrical chain mesh. Track pattern chain made of stainless steel alloy.