The Masontops Tough Bands Plastic Screw Jar Bands 4 Pack is a set of reusable bands made from durable plastic, perfect for regular mouth jars. With a rust-proof design, these screw bands are ideal for home canning and are easy to use and clean. The pack includes 4 bands, ensuring you have enough to last for multiple canning sessions. The MasonTops brand guarantees quality and reliability for all your home preserving needs.