Weststone 300pcs Crystal Clear Top Open Flat Treat Bags treat Bags 4"x 6" - 1.5mil with free twist ties 300pcs 4" x 6" - 1.5mil Crystal Clear Flat Top Open, Polypropylene (OPP), non-toxic, odorless 300pcs silver metailc twist ties included. The open end doesnt have a sticky seal and need twist ties or heat seal. Food Safe bags and good for organizing and separating candy, food, jewelry, craft supplies and others. Ridged and keep their shape, thereby protecting the items inside. Weststone is a registered trademark for Weststone International, LLC.