ONE ION Core Energy features a handsome focal core design with a combination of sturdy medical grade silicone and allergy-proof 316L stainless steel. Medical grade silicone band increases energy and relaxation; The stainless steel tang buckle keeps the bracelet fastened securely and allows the band to be easily sized. 22 highlight silicone buttons are permanently attached to the back side endow the bracelet with a power touch. As always, each ONE ION bracelet comes with a durable gift box for the best presentation and protection. --- PRODUCT SPECIFICATIONS --- Net Weight: 30ml (28 g) / Width: 0.5 in. (1.3 cm) / Material: medical grade silicone, 316L stainless Steel / Sizing: 6.25 in - 8.25 in (16 cm - 21 cm).