... silicone USB BRACELET/USB/USB bracelet:128MB, 256MB, 512MB, 1G, 2G, 4G,8GB 2) Both USB 1.1 and 2.0 available USB/USB bracelet Description (1) Material of Silicone USB drive/USB/USB bracelet ... :100% silicon rubber ,harmless for body ,Green material(2) Bracelet ... 512MB, 1G, 2G, 4G(5) Both USB 1.1 and 2.0 available(6) ...