Transparent chair mat offers exceptional clarity and is extremely durable and resilient to protect floors from wear and tear. ideal for big and tall users and heavy executive chairs. Mat is designed for hard surfaces. easy-glide top surface provides effortless mobility and causes less friction and no dishing. rectangular mat has a non studded back and straight edges on the sides for easy placement. mat is made of polycarbonate. free and clear formula produces an exceptionally clear mat that is non phthalate, non cadmium, bpa-free and lead-free.