OnRite's latest all thin skin system is a tissue thin skin system with all looped venting which means there are no knots. This system is "disposable", meaning it can normally only be used once. It should be attached using a full head bond for semi-permanent wear for 2 to 4 weeks. The system is then disposed of and replaced. The advantage of the EDGE? - you will see nothing but hair on the scalp! The large 8" X 10" size system can be cut down to any size to fit any hair loss area.