A box of 600 Dual Layer / Double Layer discs with a full face ink jet printable white surface. Aone, pronounced A one or A1 (not `A ony` like pony, as sometimes referred to) are a popular budget range of DVD media. With both printable and non printable versions of these DL discs available, Refresh Cartridges also offer a range pf DVD-R, DVD+R and CDR media of the same brand. 8.5GB twice the capacity of a normal single layer DVD disc. A DVD writer with DL writing capabilities will be required to use these discs.