The product advertised is QUNTITY 4 Napa # 801234 Chemical HFO-1234yf A/ C System Refrigerant Lubricants. It is a refrigerant lubricant specifically designed for air conditioning systems, manufactured by Napa. This product is essential for maintaining the optimal performance of your vehicle's A/C system, ensuring efficient cooling and smooth operation. With this high-quality refrigerant lubricant, you can trust that your car's air conditioning system will continue to function effectively for a long time.