Industry standard for performance, compatibility, and the ultimate in reliability. Utilizes an advanced super-eutectic phase change recording layer which ensures durability and reliability while archiving data at higher rewrite speeds. These discs allow you to rewrite data without errors up to 1,000 times. Disk Type: CD-RW. Includes 20 discs with cases. Rewritable. However, this product is a problem. Please rest assured. 2. Product warranty and other products made in Japan are not applicable. 3. Packaging and instructions are in English.