MSA Clear Plano Spectacle Unit EA. com now offers this high quality protective goggle in clear modified lenses without frame for school safety & protection of the spectacles against strong odors and excessive moisture. The frame is made of polycarbonate the same material as most hard disk drives. It has a straight down stem and an adjustable temple with a break away clasp. The sturdy frame is stackable and has a rubber nose piece and temple tips for protecting the spectacles when storing them. To make things even better each spectacle is laser etched with an index number uniquely assigned to each user. This unique feature allows each user to identify his or her own prescription strengths precisely. This feature is especially useful when a prescription cannot be obtained. Also many users report that the frames are formulated to work with many different types of materials. Some of these include acrylic polycarbonate and polystyrene. Each features a one year manufacturers warranty. Specifications for MSA Clear Plano Spectacle 454-697516: Manufacturer: MSA Weight: 0.08 lb Available quantity options: Each Package Contents: MSA Clear Plano Spectacle 454-697516 / 300072-636 The MSA Clear Plano Spectacle 454-697516 is a quality addition to the MSA lineup. For more great deals on Safety Glasses by MSA please browse our MSA Safety Glasses page. MSA Clear Plano Spectacle 454-697516 Unit EA