50 Sheets Brown/Gray Chipboard 60 Point Extra Thick 4" X 4" (4X4 Inches) Small Square Card Size .060 Caliper Extra X Heavy Cardboard as Thick as 15 Sheets 20# Paper Extra Heavy Chipboard 60pt (point) or .060 (.06 inch) thickness = 1.524mm Backing for notepads, photos, and prints Make your own albums, frames, displays, covers, backs, boxes and containers Protect your shipments - Storage of keepsakes and papers - 100% recycled clean fibers