Large sheets of waxed professional quality tracing paper. Sheets measure 26" x 39". Use the blue for toiles and white for fashion fabrics. The blue DOES NOT come out, so please don't use it on your garment fabric. The white does seem to steam out but test prior to using. Roll to store so you don't get creases or mount on a large sheet of poster board. Shipped in a sturdy tube to prevent damage. One sheet of white and one sheet of blue will last years.