Features:Lightweight and durable.Activate your natural vision ability to see clearly.Help exercise eyes muscles and relax your eyes.Special designed to improve eyesight， especially eye focusing problems.It is beneficial for the people who have problems of short-sighted， long-sighted， presbyopia， etc.Specifications:Material: ResinColor: BlackItem Length: 14cm / 5.51inLens Length: 6cm / 2.36inLens Width: 4cm / 1.57inTemple Length: 11.5cm / 4.53inBridge Width: 3cm / 1.18inItem Weight: 24g / 0.84ozPackage Size: 24.5 * 8 * 4cm / 9.65 * 3.15 * 1.57inPackage Weight: 26g / 0.91ozPackage List:1 * Pinhole GlassesNote:Please allow 1-2cm (0.4-0.8") differences due to manual measurement， thanks.