These refill cartridges are easy to replace in the applicable dispenser and, coupled with the adhesive transfer refill materials, provide the versatility of the 3M Laminating Systems.3M Dual Laminate Refill Cartridge DL951 provides instant front and back side lamination which is great for presentation materials, 3-ring binder sheets, schedules and more.It uses no electricity, there is no warm-up waiting, and no heat or irritating odors. This makes it ideal for documents which may be sensitive to heat. Professional document finishing right at your workstation!