1、The nail board toy has many round protruding points, which can be wound with rubber warp to make various graphics, which is an intuitive graphic teaching aid. 2、The four corners of the nail board are glossy and round, and will not be hurt by incisive corners during use. 3、The nail board is made of plastic material, the overall weight is relatively light, and has the performance of friction and corrosion resistance, and can be used for a long time. 4、As a teaching aid, the toy can be used to calculate fraction and recognize graphics. The intuitive demonstration helps students improve their logical thinking ability. 5、This set of nail board tools are used as children's educational toys, suitable for fun teaching at home or in the classroom. 4 x Nail Board Toy40 x Rubber Band  Item Type: Nail Board ToyMaterial: PlasticFunction: Nail board is a kind of multi-functional teaching aid that is entertaining and entertaining. It helps to transform abstract rational knowledge into vivid and real images, helps students understand the key points and difficulties of knowledge, and helps to stimulate students' interest in learning and broaden their thinking. Improve students' scientific literacy and teaching efficiencySingle Board Size: 15.5 x 17.2 x 1.1cm / 6.1 x 6.8 x 0.4in(manual measurement, there may be slight errors)