TOP GLASS was designed to provide a lightweight, shatterproof windshield with excellent water shedding capabilities for the racing industry. This polycarbonate material is almost 250 times stronger than glass and 25 times stronger than acrylic. It is coated on both sides with a highly abrasion resistant coating. The coating will resist vigorous rubbing with steel wool and has high resistance to pitting or sand blast effects. It also helps block UV to keep the window from yellowing. Our windows are 50-75% lighter than glass, depending on thickness (1/2 the weight per equal thickness) and can be cleaned with standard glass cleaner, no extra polishes or cleaners needed.