Feature: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 PlaneMaterial: PlasticSuitable Age: Primary School StudentsShape: Double StandExperiment Type: Pulley Mechanics Experiment.Package List:2 xInclined Plane4 x Bracket