An asbestos-free liner for dental casting rings that provides an optimal buffer to allow for total expansion, while achieving accurate castings and reducing the likelihood of cracking. This product is made of high-temperature, non-hazardous, hydrous calcium silicate fiberglass material. 

• Ceramic fibre material 
• 1mm thick - Roll can be cut to any ring size; prevents overlapping ends 
• 20m (64.2 ft.) length - Will not constrict investment 
• 55mm wide