This fantastic coloured LED T8 tube sleeve is a Rosco colour code of 144 which is known as No Color Blue. It fits a 4 foot (1200mm) LED tube and is 32mm in diameter making it suitable for the most currently available brands of LED T8. This straight forward product is very easy to install and has a huge impact on the feel to a space with minimal effort. To install the sleeve remove your existing LED tube slide the clear cover and No color blue insert over the tube then put your LED tube back into its fitting. Please be aware that this product does not require end caps and is not suitable for T8 or T12 fluorescent tubes.