Aluminum weight for school. Unique shape of the weight enables to hang the weight when aligned, and stack it together when placing alternately. Various experiments such as pendulum, moment, and buoyancy are possible. Anodized aluminum processed weight, which is rust registrant material, will enable to use in an experiment in the water. The depth of 5 g, 10 g, and 20 g represent the length relative to the weight, and its color difference will make it easy to measure the weight instantly. It enables to connect / stack, and different color makes possible to create playful atmosphere for experiment.