Handcrafted borosilicate glass ring. Handmade in our workshop in Barcelona. Size table: S= 15,60mm ES-IT: 9, US: 5, EU:49 M= 16,55mm ES-IT: 12, US: 6, EU:52 L= 17,51mm ES-IT: 15, US: 7 1/2, EU:55 XL= 18,46mm ES-IT: 18, US: 8 1/2, EU:58 XXL= 19,42mm ES-IT: 21, US: 9 1/2, EU: 61 Each piece is c rafted by hand and will vary slightly.