Bio Mulch film stops weeds, warms the soil and reduces water evaporation. This mulch will produce superior results while respecting the environment. BioTelo Mulch Film, made of Mater-Bi, a corn starch based raw material, is compostable and biodegradable. It leaves no toxic residues in the ground and you can save on removal, recycling and land fill costs. 48" x 200'.