Symphony composite slate shingles is a masterpiece of synthetic slate design with enduring qualities of tooled craftsmanship, natural beauty, and harmony. Symphony is a specially-engineered composite roofing shingle that mimics the look and feel of natural slate, but is lighter, more durable and a fraction of the price. Class 4 Impact Resistant. Excellent weathering capabilities for long life, combined with exceptional UV fade-resistant surface technology for superior color stability.