What does it do? If you have rips and tears in book pages, documents or maps then this is the product for you. It is a great product to re-insert and reattach loose book pages back into the book with minimal fuss. How does it work? This is a self-adhesive, very lightweight (20 gsm) paper, made with acid-free materials and a neutral pH adhesive. The adhesive side is backed with a removable silicone paper to make application extremely simple. Remove the silicone backing paper - this is the trickiest part of the operation and it might take a few moments to tease the tape away from its silicone backing paper to reveal the tape which is extremely thin and transparent. Apply it to the damaged/torn area then smooth it with (preferably a bone folder or similar) and this will remove any air bubbles, if done carefully you can create an almost invisible repair. Be aware that with some papers, especially glossy and vintage the tape can be quite visible. Why is this the best product to mend my book/document? This tape is acid-free and very lightweight, it's probably the most widely used repair tape used by book repair specialists and in libraries and museums. Unlike normal off-the-shelf tapes like sellotape it will not go yellow and brittle and fall off and it's very easy to apply. You should NEVER use normal sticky tapes for long-term repairs on paper.