This is a bottle of "Ambrulose" cement. Each is 4.2oz HDPE thick refill bottle. This is the same cement as the old Ambroid@ cement which is no longer available. This is a pure Nitrocellulose. This adhesive is a favorite for arrow fletching, wood model building and in general, very good wood and porous material adhesive. Dries very hard but not brittle. If you build small scale flying models, fletch arrows vintage wood model kit railroad cars or any other wood projects than this is the right adhesive/cement. This is a refill bottle for refilling the smaller 2oz dispensing bottle.