Sea Glass with Patterns Lake Biwa Glass These are natural sea glass collected from Lake Biwa!! They have been washed with water and naturally dried. The plastic bottle cap is for comparison. The cap's diameter is about 3cm. Please use it as a size reference. As these are natural items, they may have chips, scratches, and stains that cannot be completely removed. Thank you for your understanding. Perfect for handmade crafts, collections, etc.♪