This is a shell of a Tairagi clam (pen shell). It has spines on the ridged part. There are some chips and cracks. * Bleached and cleaned. * Please refer to the images for the size. * Not polished. Please use it for interior decoration, accessories, and handmade crafts. * We will pack it carefully to prevent breakage during shipping, but please note that some chipping may occur due to the thin and sharp nature of the shell.