This oil mister is entirely BPA free, base is made of glass and has a 4.5 ounce capacity;Use the cap to pump air into the mister (about 7-12 pumps) and press the nozzle to spray a fine, even mist;Built-in, better than ever, clog free filter; mister sprays using built up air pressure- not harmful chemicals;Oil misting is a healthy way to add more flavor to low fat cooking;Great for greasing pans, seasoning salads, misting cookie trays, making pancakes, or grilling meats