1.Dual lens magnifiers: large lens magnifications: 4X Small lens magnifications: 10X Round lens diameter is approx. 50 mm 2.Applications: these magnifying glasses are great tools for home, office and travel You can observe vivid details through these magnifiers 3.Quantity: the package includes 20 packs plastic hand lens, a sufficient amount to meet your needs 4.Apply to: the hand held magnifier is suitable for small groups, individual work and classrooms, etc. 5.Optical quality: these clear magnifying lens with comfortable ergonomic handle are suitable for seniors and people with low visionOptical quality: these clear magnifying lens with comfortable ergonomic handle are suitable for seniors and people with low vision. Apply to: the hand held magnifier is suitable for small groups, individual work and classrooms, etc. Quantity: the package includes 20 packs plastic hand lens, a sufficient amount to meet your needs. Applications: these magnifying glasses are great tools for home, office and travel You can observe vivid details through these magnifiers. Dual lens magnifiers: large lens magnifications: 4X Small lens magnifications: 10X Round lens diameter is approx. 50 mm.