TDK BD-R 50GB 4X Dual Layer Write Once in Jewel Case.

TDK Blu-Ray discs are made with a high-sensitivity recording material that is different from those used on CDs and DVDs. TDK's exclusive CuSi (Copper Silicon) recording material offers long lasting performance, fast recording and playback, and massive capacities. The Durabis 2 coating used on TDK Blu-Ray protects the disc from scratches and dust, and keeps the disc running properly. With scratch, grime and dust resistant properties, the Durabis 2 coating prevents normal handling and dust from effecting the disc and data.