The combination of premium 100 percent cotton platinum paper, with the latest micro-porous coating making the traditional darkroom paper now available for your digital printing Ultra-white without the use of OBAs Resistant to ageing and contains a micro-porous ink-receptive layer that looks and feels like the traditional Baryta base Ideal for black and white photography 25 sheets of 310 gram, 8.5 x 11 inch, and acid free