This bright blue 1200mm (4 foot) LED t8 tube sleeve accessory is a great solution to alter the light in your space for upcoming events parties and gatherings. The bright blue colour is based on the Rosco colour code of 141 making it possible to match up to existing sleeves if needed. The diameter of the sleeve is designed to fit 32mm LED tubes which is the diameter of most brands of LED tube. It is easy to install first remove your current tube slide the clear sleeve and coloured insert over and then reinstall the LED tube - then you're finished Please note that this product does not have or require end caps and is only compatible with LED tubes (not for use with T8 or T12 fluorescent lights).