(Note: you are purchasing, only the O-Rings, NOT the knob, and NOT the reel!) Up for sale is a lot of (6) Black O rings that will replace the stock O rings on your ZeeBaas oval knob. The instillation is simple, and takes only a few minutes. The O rings are black in color, and round in shape. temperature applications between -65 degrees F to 450 degrees F. They have good resistance to penetration, puncturing, ozone, weather, and salt water. Thank you for looking.