PEPPERLONELY Brand 20PC/Strand Square Stripes Shell Loose Beads 20mm (3/4 Inch) Quantity: 1 Strand, 20PC. Size: 20mm (3/4 Inch) Hole size: 1mm. Thickness: 2.5mm-3.8mm Material: shell These items are made by natural shells, so the surface may looks cratered and uneven dying. It is normal phenomenon rather than quality problem.