22w Circular Fluorescent Tube T9 Round G10Q Cool White 4000k 208mm Diameter 22w T9 Circular Tube 4 Pin 208mm Diameter Circular Bulb Cool White 4000k G10Q Cap All tubes individually boxed and we pack with lots of bubble wrap and packaging to protect in transit. Helpful Information When Buying Circular Tubes Just some general information to help ensure you buy the right size circular tube. The thickness is denoted by T9 or T5 this is the thickness of the glass tube itself. The T9 tubes have four Pins on the inside of the glass ring The T5 tubes have two pins on the inside and two pins on the outside The Overall diameter of the tubes is denoted by the wattage so don’t buy a brighter wattage than what you have as chances are it will be too big for your light and also the electronics are designed for a particular wattage.