Harder, tougher and stiffer than flexible plastic letters, rigid acrylic outdoor letters are screen printed on Acrylic or polycarbonate plastic panels and will not discolor, yellow, crack or get brittle. Rigid marquee outdoor letters are frequently used with signs which require a letter changing arm or extension pole.
Know the thickness you need. Measure with your credit cards: for thicker letters, use several cards (the non-embossed area). 1 card = 0.030, 2 cards = 0.060", and 3 cards = 0.090