The sphero nubby cover in yellow will protect your sphero from scuffs and scratches as well as shielding your sphero from damage the versatile and durable nubby cover will also give your robot excellent traction on all terrains including gravel water and concrete lm features sphero nubby cover protects your sphero robot from scuffs and scratches also provides your robot with excellent traction on all terrains including gravel water and concrete robust durable design dimensio