Photoluminescent sign – exit – green – non-adhesive this 12″w x 8″h yellowish/green photoluminescent sign is made of rigid pvc for long lasting durability and dependability. Photoluminescent coating absorbs and stores energy from ambient lighting, making sign immediately visible in case of black-out. Ideal for all surfaces, including rough surfaces and brick walls. Install with double-sided tape or liquid adhesive (not included in sign package).