They are decorative, bendable moulding used bridge the gap between walls and ceiling specifically designed for curved walls, arched doorways, bay windows, and rounded surfaces. Unlike rigid plaster, flexible Cornices are made of material like polyurethane. It highly pliable mixtures designef to fit around sharp, curved or surfaces. The primary purpose is to follow the contours of curved or spiral walls on modern or traditional architectural design. It can be paired with matching rigid profile for seamless transition between curved and straight wall section. Very easy to install. Lightweight and at reduced cost.