For the design of the Tube Watch we teamed up with Dutch Designer Piet Hein Eek. Piet’s unparalleled vision on design and LEFF amsterdam’s raw, industrial and sophisticated approach, came together in an amazing collection of refined yet tough watches. The design of the Tube Watch has an iconic ring that functions as the clock’s face. Therefore, you can recognize every LEFF amsterdam watch by this unique characteristic. Case Material: Solid Stainless Steel Band Material: Stainless Steel Case Lens: Sapphire Crystal Number Display Type: Analogue Movement: Japanese Miyota 2035 - 3 Hand Crown: Screw Down w/ Diamond Cut Teeth Water Resistance: 10ATM / 100 Meters / 330 Feet Battery Type: SR626SW (Included) Watch Face Diameter (mm): 38mm or 42mm (Depending on Size) Band Length (mm): 120/80 Band Width (mm): 20 or 22 (Depending on Size) Case Thickness (mm): 9.6 or 11.4 (Depending on Size) Watch Weight (g): 120 or 150 (Depending on Size) HTS: 9105.21/9113.90