Features:1) Disc type: general2) Disc diameter: 120mm3) Data capacity: 4.7GB4) Recording speed: 1x - 4x, 1x - 8x5) Dye type: cyanine, azol6) Recording wavelength: 650mm (circular polarization)7) Numerical aperture: 0.6 50.18) Scanning velocity at 1x: 3.49 5m/s9) Read power: < 1mW10) Shelf life: 50 years (stored at -20 - 50 degrees Celsius, <50%RH)11) DVDR book version: 2.0 general12) Stacking ring: both sides