Gold-Leaf 23kt-Glass-XX-Deep Loose-Pack of 20 Books (500 Sheets) size-3-3/8" x 3-3/8" per sheet, Surface/Loose Leaf, 17-18 Gram Weight. This is surface leaf therefore it is Loose Leaf. A packs coverage area is 39.5 square feet; each book of 25 sheets has a coverage area of 1.98sq ft. These measurement amounts for coverage do not take into consideration waste or overlap. This product is excellent for glass gilding. Glass gold is gold that is selected for its higher quality having fewer pinholes. It is loose in the book and should be applied with a gilders tip or other method of transfer. MANUFACTURED IN THE USA! Produced by the last American Gold Beaters! Gold-Leaf 23kt-Glass-XX-Deep Loose-Pack available here.