The last photo is a stock photo. These polypropylene strapping kits are complete with strapping, wheeled cart, tensioner, and compatible seals and sealer.These items work together to perform all the tasks required to store, transport, strap, and secure strapping. Polypropylene strapping, sometimes called poly strapping, is a lightweight strap used to bundle newspapers, seal and bundle cartons, and secure light loads. Strapping is wrapped around a bundle and tensioned, then a seal is applied to maintain correct tension. Cart, Sealer, Seals, Strapping, Tensioner.