Features: Standard 1/4inch NAB hub optical shaft adapter is of wide compatibilities, for optical reel to rrel tape recorders. Exquisited craftsmanship, high precised, which ensures perfect fit. Quality material, full of durability and consistent performances. NAB hub adapter circlet is for 10inch optical reel to reel tape recorders. Upgraded your recorder accessories with this essential component, designing to easily integrate into your existing equipment enhancing sound quality. Specifications: Material: Rubber Color: white, black, blue, red(optional) Size: approx.56mm/2.2inch, 45mm/1.77inch Height: approx. 35mm/1.38inch (more detail size please refer to pictures) Quantity: 1 Pair Package Includes: 1 Pair Optical Shaft Adapter note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.