Red Devil empty 30 oz. (900 mL) caulking cartridges are important for any construction or renovation project. They're made of high-quality HDPE (High-Density Polyethylene) plastic material and are durable, washable, and reusable. The attachable nozzle can be trimmed as desired to control the width and speed at which the product is dispensed. These reusable caulking tubes are great for dispensing all kinds of sealants, adhesives, epoxies, and more. The cartridge will fit any 13” caulking gun. Just fill the cartridge with the material you're working with, insert the plunger in the bottom of the cartridge, clip the cartridge nub to allow easy flow of material, trim the tip of the nozzle to your desired bead size, screw trimmed nozzle onto the cartridge nub, load the filled and clipped cartridge into a 13” caulking gun, and dispense the filled material.