Its a modular car set with 3 bases and 6 tops so little ones can turn a car into a camper or a pickup into a tow truck! Sleek, simple and stackable, babu Rollers are a modern twist on toy cars for toddlers that offer pure and simple creative play options. Mix and match the colorful wooden tops and bases to build totally unique vehicles with smooth-rolling wheels! Its a beautifully crafted auto collection thats a tactile, timeless addition to your wooden toys. Each piece is crafted from solid hardwood with a non-toxic, BPA-free, water-based finish.