WB-.999-Pure-Silver Leaf Patent-Pack of 20-books-Silver -leaf contains 500 sheets of Silver-Leaf, size-3-3/8" x 3-3/8", Patent/Transfer-Leaf, 28 Gram Weight. Silver is a very early Karat weight. WB-.999-Pure-Silver Leaf Patent-Pack is packaged attached to white-paper and placed between the sheets of paper in each book of Silver. Patent or Attached Silver-Leaf is attached to paper to assist in transferring thin delicate Silver-Leaf to avoid damage from wind or wrinkle. Patent-Leaf is help-full if you haven't learned to use a gilders Tip. Each Silver-Leaf Pack contains 20 Books or 500 sheets. Each Book contains 25 sheets of Silver-leaf, sheets of Silver Leaf measure 3-3/8" x 3-3/8" inches square. 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. WB-.999-Pure-Silver Leaf Patent-Pack available here.