This Swatch 21mm replacement bands are made to fit the following models: Originals(Alarmchrono, Automatic, Autoquartz, Chrono, Gent, Midi Aqua-Chrono, Musicall, Scuba, Solar, Stopper) and Irony(Automatic, Big, Medium, Midi Chrono, Scuba). Swatch Originals Gent is by far the most iconic and popular model of Swatch watch. - Perfect fit for 21mm Swatch watch. - Length: 123mm + 85mm | Thickness: 3-8mm - Made of non-allergenic waterproof silicone rubber. - With hypo-allergenic silver plated stainless steel buckle. - Free set of matching spring bars included.