18mm Replacement Waterproof Silicone Rubber Watch Strap Watch Band for SUIK400|SUIB400 Swatch (Black) Length: 120mm + 82mm | Thickness: 3-5mm Perfect fit for SUIK400|SUIB400 Swatch watch. Waterproof and lightweight, yet sturdy  ideal for those with an active lifestyle. Made of non-allergenic waterproof silicone rubber. With hypo-allergenic silver plated stainless steel buckle. There are anti-skid lines on the back. Free set of matching spring bars and a tool included.