Clear Makrolon SL2 Polycarbonate Sheet backboards are stronger than acrylic and virtually unbreakable. Acrylic backboard material can become brittle and shatter. Makrolon is lightweight, non-splintering, transparent, and easy to machine and form. Features double-sided UV. coating in 2- and 3-mil thicknesses that won’t yellow from sunlight or degrade over time. Material also is used in variety of architectural, transportation, engineering plastics, and digital graphics applications. Sheffield Plastics, Inc., Sheffield, MA