The popular and affordable Discover chair is available with casters, promoting collaboration and mobility in the classroom. Discover chair shells are a single-piece unit molded of flexible polypropylene. Ergonomic design of the shell and waterfall front edge promote comfort for students while still remaining a budget-conscious option for schools. Ribs along the back of the seat shell contribute to its strength and also prevent movement when the chairs are stacked. Casters are installed at the factory and are 2" diameter rubber wheels which swivel for optimal movement.