No. Though they look like glass, our ClearBoss Conference Room Signs are actually made of acrylic. The 215 mil (0.22 inch) thick acrylic sheet is crystal clear like glass but much more durable than glass and shatter-resistant too. ClearBoss Signs are also resistant to abrasion and dents. An acrylic product can last for several years with minimum damage. The strength of acrylic plastic is due to its chain-like structure. Though chances are low, if an acrylic plastic sign does break, it does not shatter into a million small pieces like glass; but rather splits into large pieces.