Hexnub Cover for Sphero Robotic Ball 2.0 & SPRK and Bolt App-Enabled Toys - Accessories to Protect Your Robot - Green Compatible with all Sphero Ball Editions Including Sphero 2.0, Sphero Bolt, Sphero SPRK+ and Sphero SPRK - Does NOT Fit Sphero Mini Ball. Add Grip with the New Sphero Nubby Textured Cover! Made from a Semi-Transparent Material, Easy for Calibrating your Sphero Robot Ball. These Sphero Cases are Highly Durable & Easy to Clean, making your Sphero Toy Child-friendly Hexnubs Sphero Robot Ball Accessories Protects from The Elements. Colors Available - Green, Blue, Black, Pink, Yellow & Clear (works great as a Sphero Bolt Cover) Hexnub Sphero 2.0 Ball Cover High Quality Silicone Rubber Improved Grip and Traction Over Terrain Nubby Textured Surface Available in Blue, Black, Yellow, Green, Pink and Clear Easy to Clean and Maintain Added Sphero Protection