Pure element simple substance, size 1.5". Manufactured to the highest standards by Shaanxi Top Metal. Totally handcrafted, metal straps and natural colors. They are perfect for collection, hobby, DIY, laboratory experiments, R&D in facilities, laboratories, universities, schools, and more. More choice from Al, Fe, Cu, Mo, W, Sn, Sb, Ti, Ni, Zn, Cr, B, C, V and other common metals Nb, Au, Pt, Ir, Gd, Sm, Nd, Ag, Lu, Os, Pd and so on.