the industry's first compostable vacuum cleaner filter bag to be approved and validated by underwriters laboratories ul and to earn the certified bio-based product certification and label from the united states department of agriculture usda. All products and packaging materials are made from 100% renewable resources designed to be recycled and/or biodegrade when aerobically composted reducing the amount of valuable resources entering our landfills to meet federal trade commission ftc green guidelines. Windsor replacement compostable vacuum bags are made of 4 ply cellulose made from 100% renewable resources. For use with windsor sensor, sensor xp12 & versamatic plus, allstar javelin 12'' series. Sold in quantities of 50. 1 year limited warranty. ***vacuum filtration bags are to be used with machines only, they are not to be repurposed for any other use.***