These pre-assembled units are constructed with a tough wire frame covered with a three different cover options to suit your needs. Each end has drawstring elastic closures and ground pegs for a secure fit and stability. Plants can easily be accessed through the lift-up sides. Each unit assembled measures: 10' 2" l. x 1' 8" w. x approx. 1' 3" h. This tunnel creates a warm and humid environment to get your plants off to an early start. This cover is made of tough, clear polythene allowing the utmost heat and lighting in for speedy growth.