Hexnub Sphero Ollie Monster Tyres Designed for Traction By (Black) Transforms your Sphero Ollie Robot into an off road machine! Customize your Ollie Robot with the most Extreme Ollie Accessories - Super large tread for maximum traction and handling! Compatible with Sphero Ollie and Sphero Ollie Darkside Edition. Also Compatible with all Original Sphero Ollie Hubs and Sphero Ollie Tires. Tires are Highly durable & easy to clean. Sphero Ollie Toy and Accessories sold seperatly Choose from 5 Awesome Colors  Red, Black, Blue, Green and Pink