With moderate use, your Gleener Edges will last 1-2 years. However, if you have a big Gleening project in the works or need to replace lost or worn Edges, look no further. The Gleener Replacement Edge Set includes all 3 fabric-sensitive Edges. Edge #1: ideal for big & bulky pills like those found on heavy woolens, blends and synthetics. Edge #2: best for medium pilling like those found on cashmere, merino and finer wools. It also works great on fleece. Edge #3: revitalizes your summer knits, t-shirts and ultra delicates by removing fine pills. For best results, use on an ironing board.