Features: 1.3 Heights: This inclined plane allows you to use three heights to explore the pulley force, designed specially for primary students. 2.Clear Scale: This basic inclined plane is designed with clear scale on the panel which ensures convenient measurement and observation. 3.Easy Operation: This inclined plane kit can be easily assembled and operated, kids and students can easily build up with their hands, tools are not required. 4.Wide Application: These inclined plane components are suitable for school experiments and teaching. Provide professional experimental equipment for primary school mathematics and physics experiments. 5.Durable Plastic: This inclined plane for experiment is made of strong and durable plastic material, sturdy structure ensures high stability. specification:Item Type: Inclined Plane Material: Plastic Suitable Age: Primary School Students Shape: Double Stand Experiment Type: Pulley Mechanics Experiment PackageList:2 x InclinedPlane 4 x Bracket