Stylish in Silver. This Unisex 300 Gauge Box Chain is 4mm wide and made with .925 Sterling Silver for a beautiful polished look. This classic chain makes a perfect gift for that special someone in your life. At such an affordable price, you should pick one up for everyone on your list this holiday season when you order yours today. Note that this chain is available in lengths ranging from 16 Inches to 30 inches.