They are; manufactured from Mater-Bi ® GM-free cornstarch biopolymer, type of molecule in living organism from the grain, corn starch that is not taken from the food chain, accredited to BS EN 13432:2000 and ‘OK-Compost’ hence suitable for home composting and food waste collection, come in different sizes and thickness from 10litres to 240litres and 16 microns to 40 microns respectively, break down to natural elements carbon, oxygen and hydrogen, leaving no contaminants, they are manufactured in Italy to keep the carbon footprint to the minimal, also with our membership package you get a free bio.box(see picture) and a year long supply of liners for £15 one off fee and £10 or less per year (see attachment). email for more.