These labels are 100% water-soluble and biodegradable that do not leave sticky residues or clog up the drainage pipes. They are perfect for keeping track of contents and their date and time of preparation. The labels stick to any dry and grease-free surface such as the range of iSi Siphons, or plastic and metal containers. Double sided tape is included to attach the dispenser to wherever it is needed, on the wall for instance. The labels last for a maximum of six months after opening the packet.