PEPPERLONELY Brand 50PC Natural Spiral Seashell Beads 28x16mm - 16x9mm Quantity: 50PC Size: 28x16mm - 16x9mm (1-1/8 x 5/8 Inch -5/8 x 3/8 Inch) Hole size: 1mm Thickness: 12mm( 4/8 Inch) - 8mm( 3/8 Inch) 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.