You can easily check the rest of the tape in the display window. Open lock button for easy opening and closing Correction tape (refill type) Specifications: Tape Size: Width 0.2 inches (5 mm) x Length 49.2 ft (12 m) Outer Dimensions: Width 0.8 inches (21 mm) x Depth 4.1 inches (105 mm) x Height 1.8 inches (45 mm) Vertical pulling type