This product is designed for rock climbing. It adopts quality plastic material, nontoxic and tasteless, safe to use and feel comfortable with it. Designing according to human body mechanics.Features:Made of quality plastic material, this rock climbing stone is rather firm and durable.Bright colors, nontoxic, tasteless and anti-ultraviolet. Installation in all directions does not affect the feel and grip of your hands.Designing according to human body mechanics, comfortable to handle and safe to use.Suitable for using in kindergartens, schools, amusement parks, underground classrooms, corridors, walls of outdoor buildings, etc. Specifications:Condition: Brand NewItem: Rock Climbing StoneMaterial: PlasticOptional Color: Red, Blue, BlackSize: Approx. 12.5 x 10 x 6cm / 4.9 x 3.9 x 2.4inchInstallation method.1. Use an electric hammer to drill a 3-4 cm hole in the wall2. Use the expansion nails to gently tap into the hole and be flush with the wall3. Use a steel cone with a diameter of about 9 mm to spread the inner expansion nails4. Use a screw to penetrate the rock and wring into the inner expansion nail. Use a hexagonal wrench to wring until the rock point does not slidePackage List:10 x Rock Climbing Stone20 x Screw20 x Nut20 x Pad.Note: Don't wring the rock too hard and break itChildren must be supervised when climbing, and safety belts must be installed if installation are too high (buffer sponge pad on the bottom)