Our wheelie bin liners are made from corn starch and are 100 percent biodegradable and compostable. All of our wheelie bin liners are certified to BS EN 13432:2000 and carry the European standard seedling logo. Please note that all compostable liners should be used within 12 months of the purchase date. Technical 120/ 140 litre Wheelie Bin Liners 480+470 mm (w) x 1300mm (h) laid flat 22 micron thick Full usage instructions are supplied with all our liners. How to use Please read the information on the side of each liner. Do not attempt to lift the liner from the wheelie bin when full. To help ensure the bag remains intact for the whole 2-weeks between collections:Keep your wheelie bin out of direct sunlight where the heat would accelerate the break-down process.Avoid putting grass cuttings into the liner until nearer the collection date. This material is the most likely to start the liner break-down, due to the heat generated as it starts to compost down, so if in contact for 2 weeks, the liner may show signs of break-down and leakage before being emptied. 3 liners per roll included