Material: Eco-friendly silicone with ions. Power: Each power bracelet with 1000~2000 ions Color: Ususl 10 colors for you to choose, your request colors are ok. Size: XS / S / M / L: (16cm / 17.5cm/ 19cm / 20.5cm). Quality: High quality with SGS, RoHS ceritificate. Package: 1 PC/box bag, 250PS/CTN Feature: Good flexible, no deformation, fashionable, enhance the power of concentration. Reduce fatigue. Various power bracelets, Custom design are acceptable