Haxnicks Easy Micromesh TunnelEasy Micromesh Tunnels protect your growing crops from all types of pest, without the use of nasty chemical insecticides. Key Features: The ultimate insect barrier for fruit and vegetables! The Micromesh cover has an ultra fine mesh size of 0. 6mm x 0. 6mm, which is small enough to keep out Cabbage Root Fly, Carrot Fly, White Fly, Onion Fly, Flea Beetle, Vine Weevil and Aphids and others while at the same time allowing air and moisture to circulate.