The material from which the front of a watch is made e.g. mineral, crystal, plastic, resin, sapphire. It is published by the International Electrotechnical Commission (IEC). Watch glass type. Cooldown, Cycling, Dance, Diving, Elliptical, Golf, HIIT, Hiking, Kickboxing, Paddling, Pilates, Rowing, Running, Skiing, Snowboarding, Stair stepper, Swimming, Tai Chi, Walking, Wheelchair, Yoga, Core training.
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