The Musty Step Up Board can be added to many of the stylish Musty chassis (4 Rider Single Spoke, 4Rider Light, Urban Rider) for a fun ride your toddler will love. While mom pushes baby, Mutsy's Step-Up Board allows toddlers to safely and happily ride on the back of the stroller. No tools are necessary to easily attach the Step-up, and the cool design of the board actually provides a no-slip surface for safer rides. Ideal for tired toddlers, this step-up board is suitable for children from 2 years+.