IKO Cambridge Architectural shingles are built heavy-duty. It’s a difference you can see and feel. Distinguished by its random shake-look design, unique dual band shadow coloration, and superior thermally activated shingle sealant. With built in algae resistance to help inhibit the growth of bue-green algae that can cause unattractive black stains and discoloration. IKO Cambridge shingles are engineered to provide superior protection against wind uplift and water penetration.