Scientific Laser-Art Shingle Sheets sheets offer limitless flexibility for roofing on your HO Scale buildings. Sheets feature easily removable rows that can be used by themselves, or even cut into individual shingles. Weathering them with hobby weathering products yields a nice aged appearance. Lifting some of the shingles can simulate wear and decay, and removing some areas of the shingles completely, exposing the sub roof underneath gives you an even more worn look. The extent of weathering and the desired effect you are looking for is totally up to you.