Ergonomic Design: Optical Flipper features a round handle that is easier to flip and position, providing enhanced comfort and precision during use Material: Constructed from quality pp, ensuring long-lasting durability and reliability for professional or personal use Compact Size: Ophthalmic Lens Holder With dimensions of 21 x 12.5 cm, this lens is designed for easy handling and storage, making it a convenient tool for optometrists or hobbyists alike Single Unit Packaging: Each purchase includes 1pc handheld Flip Trial Lens, securely packaged to ensure it arrives in great condition Versatile Application: Ideal for various optical assessments and adjustments, this tool is essential for anyone requiring precised visual measurements or corrections Size Chart: 21cmx12.5cm/8.27inchx4.92inch Package Includes: 1pcFlip Trial Lens Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.