Size: 36*48 Smart Carpet Protection – These computer desk chair mats create a smooth rolling surface for low-pile wool carpets to reduce scratches or {url removed} please don't use it on any medium pile carpet or High pile carpet. Clear, See-Through Design – The large, square shape and transparent format lets the color or floor style shine through without detracting from home or office décor. Skid-Resistant Studded Bottom – Each office desk chair mat features a rubber “stud” bottom that helps keep it from slipping, sliding, or moving around when rolling. Heavy-Duty Resilience – Offering family-friend durability, these under desk mats are free of phthalates, toxins, cadmium, tin, or lead for safe, long-lasting reliability. Personal or Professional Use – desk chair mats can be used in your home office or at work to create a more stable, comfortable, safe working environment.