Table mirrors can be divided into plastic mirrors, quartz glass mirrors, and sapphire mirrors. Collar mirror is not afraid of falling, but it is easy to wear. The sapphire crystal is the most wearable. Case, strap material common plastic, copper, stainless steel, tungsten titanium alloy, high-tech ceramics, gold and so on. Sapphire glass, Tungsten-Titanium alloys and high-tech ceramics are materials that are not easily abrasive. Their hardness can reach Moh's 9, Grade 8, Grade 7 (Diamond Grade 10).
Although these materials can not easily wear, but they can not withstand strong impact, while some of the same or higher hardness of the material, such as diamonds, corundum, oxide metal, quartz crystal may have damage to these materials. Grinding stones, sandpaper, nails, granite surfaces, concrete walls, and floors all contain these substances and scratch the surface of these materials. The case and strap must be cleaned regularly. The watch should avoid contact with various chemical specialties. Once it is touched, it must be cleaned in time to avoid discoloration and loss of the coating.