FKM rubber strap, 20 mm. Exclusive Briston 2-part matt British Green FKM fluorocarbon rubber strap. Briston-engraved stainless steel buckle. Double spring pump presto system. Interchangeable without tool. Width: 20 mm. Length: 75/115 mm. Fits all our watches with a 20 mm horn width (except Streamliner Urban).