The safety shields are available in two sizes with different thicknesses and are made of high quality, clear acrylic; are free standing, portable and stable, and are all fitted with non -skid feet. Art. 571 is designed to provide laboratory and healthcare personnel with facial protection from hazardous substances, aerosol and splashing. Art. 572 is designed to provide additional protection from radiations while using beta emitting isotopes, including P32.