Sea glass collected from the ocean. They are large and thick. Please refer to the 1-yen coin and the grid (1cm/square) for size reference. Photos of both sides are also included. Washed with water and neutral detergent. Since these were picked up from the sea, there may be scratches and stains. Not recommended for those who are concerned. Perfect for display, handicrafts, or crafts. *1-yen coin not included.