Our wheelie bin liners are 100% biodegradable and compostable as they are made from cornstarch. Wheelie bin liners are certified to BS EN 13432:2000 and carry the European standard seedling logo. Please note that all compostable wheelie bin liners should be used within 12 months of purchase. Full usage instructions are supplied with all our liners. Technical Contents: 3 Bags (1 Roll)240 litre Wheelie Bin Liners 540 mm (w) x 1400mm (h) laid flat 22 micron thick. (laid flat measurement total=110cm across top of bag) Full usage instructions are supplied with all our liners. Please note that liners should be used within 12 months of the purchase date. These sacks are not plastic - please read the instructions on 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.