HARMLESS AND COLLECTIBLE: You will get 20pcs of 10mm harmless and study elements Square including W, Mo, Ti, Zr, Ni, Cu, Fe, , Sn, Y, Co, , Bi, Al, , Mg, C, , Sb, In. HIGH PURITY: The back of elements Squares 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%, -99.95%, Y-99.95%, Co-99.95%, In-99.995%. Widely used: tungsten Squares can be used in laboratories, offices, sciences, teachers, gifts, and scientific demonstrations. It is suitable for different ages and has a good understanding of metal, elements, and density. Interests can be collected as art. Lab grade high purity material, almost the best purity you can get in market. The : This product can be collected not only, but also as a gift to family and friends. Suitable for birthday gifts, graduation gifts, Christmas gifts, wedding gifts, etc. Colour:As Shown Material:Metal Size:10mm Package Contents: 20 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.