Please take a look at my profile. These are transparent acrylic stones. They weigh approximately 3 kilograms. I haven't counted them, but there are probably over a thousand. These were purchased or obtained through games. I haven't used them for anything and have stored them in a dark place. They come in various shapes. Please refer to the second photo. The weight is approximately 3 kilograms, so please allow for slight variations. Colored acrylic stones are also available.