Manetti 23.50kt-Dukaten-Orange-XX Gold-Leaf Patent-Book of 1-books-gold-leaf contains 25 sheets of Gold-Leaf, size-3-3/8" x 3-3/8", Patent/Transfer Leaf, 18 Gram Weight 23.50kt. Dukat or Ducat or Orange gold is a very early Karat weight. This came from melting down the Austrian "Dukat" coin that was a very popular form of currency in early Europe. Manetti 23.50kt-Dukaten-Orange-XX Gold-Leaf Patent-Book is surface leaf therefore it is Loose Leaf. Each Book of 25 sheets has a coverage area of 1.98sq ft. without consideration for waste or overlap. This product is great for glass gilding and surface gilding. It is loose in the book and should be applied with a gilders tip or other method of transfer. Manetti 23.50kt-Dukaten-Orange-XX Gold-Leaf Patent-Book available here.