I'm selling some of these because I have a lot of similar ones. They are large marbles, about 2.4cm in diameter. I'm not sure if it's clear in the photos, but many have scratches, and some have cloudy surfaces. I just rinsed them quickly with water, so the cloudiness might come off if you wash them properly. They have air bubbles and dark streaks, which gives them a retro and cute look＾＾ Marbles Showa Retro PythagoraSwitch