The barrier film is used for covering items likely to become contaminated during a medical procedure, tattoo, or piercing. It is used to prevent contamination and cross-contamination. This Barrier Film comes with 1200 perforated sheets. Each sheet is 4" x 6". Some items during tattooing that you may cover with barrier film include power supply knobs, lights, arms of chairs, and other various locations in your tattooing or piercing room.