Lineco Jewel Case Insert (Pack of 100) Self-adhesive insert to protect CD or DVD discs Case uses Corrosion Intercept Technology that increases the lifespan of your discs to 40-years according to extrapolated age testing. Ozone and reactive oxygen can cause the metal layer of CD or DVD discs to break down and oxidize, making it unreadable. Corrosion Intercept protects against this failure, and prevents bacterial growth as well. Compatible with CD or DVD in jewel case