25 Pieces per unit. Oval 25x18mm is about 1" x 11/16" flat back acrylic (plastic) clear transparent cabochons. Height: 6.09mm. Light weight when compared to glass. Popular for jewelry making, DIY earrings, pendants, bracelets, etc. Simply have a print under it and let the magnifying effect do the job! Also Perfect for acrylic displays as caps or feet, crafts and all kinds of decorations. Popular for jewelry making, crafts and all kinds of decorations. High Quality Professional grade, cabs are solvent bondable. Clear without any backing these cabs will magnify what is underneath. Use your own glue. Acrylic cabochons (cabs) are solid, transparent, polished and void-free. They are flat on one side and convex on the other. They are made of Plexiglass and are produced by injection molding. Injection molding means that each cab has an injection gate mark, or small blemish at one point around the edge.