Introducing the Blok 31, our sophomore timepiece designed for clear and intuitive time telling. We removed the timer bezel, simplifying the dial and highlighting our iconic offset hour bloks. BK31 also features the much anticipated addition of lume. The hands, dial and even the recessed minutes in the case all glow. 31mm Case Diameter Ronda Swiss Quartz movement Mineral Crystal lens Screw down crown (waterproof to 100m) LUMINOVA on hands and dial LUMINOVA minutes in the case The design focus for this wristwatch was teaching our youngest kiddos to read time. Though little future astronauts were the target, we landed on a unique and modern watch suited to any age group. The watch comes with a matching small size strap, fitting a range of 5" - 6" wrist circumference. This comfortable, run-thru strap is easy to adjust and swap out for different colors or sizes .