Build strength and improve coordination. Oh yeah and have fun too with the PlayStar Climbing Rock Add-on Kit which includes four uniquely shaped resin “”rocks”" that can be gripped from any angle. The extra large size provides twice the surface area ideal for smaller hands and feet.About PlayStarPlayStar was started in the Heartland of America in the garage of an entrepreneur with this dream: to build a foundation of people who were hardworking friendly professional and self-motivated to “”do the right thing”" to offer the ultimate customer service and provide the highest value best quality and most innovative products. All PlayStar Playsets are designed following company safety standards that exceed government guidelines to enhance your child’s physical development and social skills.