Alpine 100' Black Vinyl Tubing for Ponds 5/8 inch ID x 3/4 inch OD, 1/16 inch wall 100 Foot Roll Constructed of flexible, plasticized polyvinyl chloride (PVC) Sunlight will not penetrate it, so algae growth inside is inhibited Practically invisible underwater, non-toxic, fish safe 5/8 inch ID x 3/4 inch OD x 1/16 inch wall thickness, working pressure 30PSI at 69F