Description:This is a perfect DIY experimental toy that can cultivate children's interest in physics and science, and can also help children improve their hands-on skills.This toy has smooth edges, no burrs, and will not hurt children's hands, the harmless and environmentally friendly materials make your children safer to play.It is made of high quality plastic and metal material.The length of the product is 26.5cm, and the width is 7cm, the height is 14.5cm.It can be regarded as an ideal gift for your kids.Item Name: DIY Pulley Dynamometer ModelMaterial: Plastic,MetalSize Details: 26.5cm x 7cm x 14cm/10.43" x 2.76" x 5.51"(Approx.)Notes:This toy can let your child understand the principle of the pulley.Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x DIY Pulley Dynamometer Model