Weed Barrier Keeps your landscaping looking sharper longer! Effectively controls unsightly weeds and seed germination reducing the need for chemicals and weeding - saving you time and money. Tightly woven polypropylene is permeable to air, water and other valuable nutrients promoting healthy plant growth. Will not rot, mildew or become brittle. Easy to install. Standard Grade 4.75 oz, 3 ft x 50 ft, 5.5 lbs.