Weather and scratch resistant. Attractive high-gloss finish. Good optical clarity (92% light transmittance) Up to 20X stronger than glass. Use in check valves, visual flow equipment, and many lab and experimental Acrylic/Plexiglass balls are durable, scratch-resistant, and tougher than glass; making them a perfect fit for any number of projects! Light-weight, tough, and scratch-resistant; making them perfect for projects ranging from the artistic to the scientific! Use them in your next arts-and-crafts project, your next science experiment, or accentuate your home decoration!