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. in description you will find the minimum and maximum diameter that you will find in the package. In the site https://trentonieyqh.activoblog.com/26796039/top-ultime-cinque-zafferano-notizie-urbano