Product Code: 42014 WS-100 Yagami Corporation This item can be used for mechanical experiments such as levers, pulleys, wheels and axles, and inclined planes. The material is brass with chrome plating, giving it a glossy finish. The weights are 100g x 10 pieces. I purchased this for science experiments in a cram school, but I never used it. The purchase price was ¥12,650 (including shipping). Purchase date: November 2021