Pink Pig black paper pads are made with acid free, archival grade cartridge paper. At 150gsm, its great for all types of media, dry or wet, including inks, paint, coloured pencil and much more. Pink Pig black paper pads are popular for mounting photographs, artwork,and craft collage. They have a practical wire-binding that lasts longer than glue, and lets you fold the book any which way you like. Available in a range of sizes.