Sony Blu-ray Disc 10 Pack - 25GB 4X BD-R - White Inkjet Printable "hard coat" hardened protective film to prevent scratches proprietary read-write errors that cause adoption Blu-ray phase-change recording film uses inorganic disc less susceptible to ultraviolet rays Capacity: 25GB Max Speed: 4x Packaging: 10 Pack each with 5mm Slim Case