Our Ploy Sleeve (PART-B) is manufactured from a (Low-Density Poly Ethelene), (LDPE), which is #4 recyclable. Only virgin materials are used to ensure consistent scattered light transmission to your tree or vine and UV stabilization to the Poly Sleeve. UV stabilization allows our Poly Sleeve to withstand the suns hash UV rays that might otherwise be affected by using recycled materials. Blue-X® grow tubes measure 3.5-inches in diameter and have an outdoor life of 3-5 years.