ONE ION Core Energy Power Wristbands - 6 Colors Available ONE ION signature versatile waterproof wristband. Features a perfect combination of sturdy medical grade silicone and allergy-proof 316L stainless steel. 6 Colors available now! Including limited red / green. Sizing: 6.25 in - 8.25 in (16 cm - 21 cm). Width: 0.5 in. (1.3 cm). Comes with a bracelet box for the best presentation and protection. Free delivery within 3 - 5 business days.