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. Per description you will find the minimum and maximum diameter that you will find Per the package. Per mezzo di https://donovantwace.gynoblog.com/26378820/zafferano-cose-da-sapere-prima-di-acquistare