... silicone USB circle drive cover case made from 100% silicone, nontoxic, environmental-friendly product.2. Print: Silk print, offset print, epoxy, engraved, ... service.4. Quality:Plastic silicone USB flash drive cover case with high quality, professional Quality Department follow ... function and Data protection function available - Operation systems supported: Windows 98/ME, 2000/XP/Vista, Mac OS 9. ...