Specifications Hign-concerned Chemical:None Origin:Mainland China Ring Material The shell of the T5577 ring is made of zirconia gemstones. We use a pure manual polishing, polishing, and chamfering process to make the surface of this ring smooth and not easy to leave fingerprints. From a visual and tactile perspective, it will not make people feel that it is too bulky and thick. You can take it to shower and wash your hands. Ring Size Sizes determined according to American standards: 6 #, 7 #, 8 #, 9 #, 10 #, 11 #, 12 #. Allowing you more choices without worrying about not having a ring that fits your size. Usage Scenario ID smart cards with a frequency of 125kHz, such as TK4100 (EM4100) and EM4305, can be rewritten and replicated. Used for smart home and access control. Product Advantages The ring made of zirconia all ceramic will not be damaged even when dropped at a height of 1 meter. It is waterproof, not easy to stick dust, and can be wiped clean with a clean cloth. You can wear it for outdoor activities such as running, swimming, etc.