Smartbuy Features: For use on writers or recorders that support DVD+R Dual Layer. Writing speed up to 8X. Ideal for high-speed recording. Broad read compatibility with most DVD-ROM drives and DVD video players. Ideal for high-volume data recording, archiving and video pre-mastering. Precautions: 1. Avoid fingerprints, dust and other soiling on the disc. The disc can be cleaned with a soft, lint-free cloth. Don't use any solvents or protective liquid. 2. Do not hit the edge of the disc. 3. Protect the disc from excessive heat, moisture and direct sunlight. 4. Please use soft felt-tip pens to label the disc. Marker and Pen Features: Pen with permanent safe ink specially designed for writing on discs. This marker is water based. After longer periods without use, it may need to be slightly moistened to allow smoother ink flow. Permanent and non-toxic. Perfect for writing on any CD/DVD/BD surface.