HARMLESS AND COLLECTIBLE: You will get 16pcs of 10mm harmless and study elements Square including Cu, Al, Sn, C, , Ni, Sn, W, Mo, Fe, Bi, Ti, Zr, , Mg, Sb. HIGH PURITY: The back of Elements Square are curved with purity of is up to 99.9%. Al-99.99%, -99.995%, Ti-99.5%, Sn-99.99%, Fe-99.99%, Bi-99.99%, Ni-99.5%, C-99.9%, Cu-99.95%, W-99.95%, Mo-99.95%, Zr-99.4%,-99.95%, Mg-99.99%, Pb99.99%-, Sb-99.9%. Smooth carving and cutting production: All these Elements Square are accurately double-sided carved and cut, with a density almost identical to theoretical data. Vacuum packaging: Density metal Square vacuum packaging to avoid oxidation Wide range of applications - and gifts for teachers, students, children, friends, chemistry or science enthusiasts, etc; Perfect decoration for home or office desk decoration; Excellent teaching tools to stimulate learning interest and deepen students' memory of the periodic table. size: 10 x 10 x 10mm Material: Metal colour: As shown Package Contents: 16 x Elements Square Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.