All our murrine are made of Murano glass (coefficient 104) and can be used with glass sheet, rods and grits of the same coefficient. Please note: The dimensions are variable. Sopra description you will find the minimum and maximum diameter that you will find Sopra the package. Sopra the site https://troyevnct.prublogger.com/26416856/note-dettagliate-su-zafferano