tottlr climbing cube - indoor climber - cpsia certified safe - great climbing triangle alternative - wooden toy - (cube only) tottlr expand your little one's horizons with tottlr’s fun, safe, and innovative climbing cube tunnel for kids. made from birchwood, our toy features a simple, sturdy and splinter-free wood design. inspired by the climbing triangle and the montessori method, our cube also encourages toddlers to climb at their own pace and learn their body's strengths and limits in a safe environment. perfect for indoor play, our cube and tunnel can be combined with other climbing structures for kids to create an indoor playground at home or in a classroom. your kid's balance control, motor skills and muscle growth will increase all while they're enjoying themselves.