Material : Borosilicate glass Size : #9, 11,13 or other size Glass sphere Φ7mm / Ring thickness 4mm approximately ※ Please let me know your ring size ( US size or EU size,) and colour ( White or Black) which one you like. ※ I will send it with the paper box. ※ It's handmade work so the image of the photo might be a bit different as the original. ※ It's made of borosilicate glass so It's stronger than soft glass but It is breakable If you drop it of smash it. I can fix it If it has got problem but please be careful when you wear it.