The Ateco 4635 piping bags are the perfect disposable choice for the home baker or cake decorator. These bags are very flexible, leak-proof and strong and being a disposable product make for an easy clean up. They are constructed of Polypropylene and are strong, flexible and will not balloon out when piping thick frostings. The clear bag allow you to easily identify the colored icing in the bag. Just snip the end to allow a tip or tip coupler, and start icing. These are the same type of bag as the Ateco 4675.