Changing your existing 4 foot LED tubes output to an incredible Primary Green coloured light this sleeve accessory boasts ease of installation for an incredible change to your space. To install this product you have to remove your existing LED tube slide the coloured insert and clear sleeve protector over it then re-install the LED tube. Once installed the light colour will be a primary green colour which is matched to the Rosco colour code of 139. the 32mm diameter is suitable for most makes of LED tube however please check that yours are the correct size to fit this product. Important note - this product does not come with end caps (not required) and comes as two components (clear sleeve with primary green coloured insert).