15 oz Unprimed Cotton Duck This is a very popular canvas for large projects. It is a very heavy cotton canvas with a nice medium weave. Approximately 15 ounces per square yard. <font color=red>This weight and weave has been so popular that we just added more width sizes This material is sold by the running yard. If you order 3 yards, you will recieve one piece 3 yards long not 3 separate one yard pieces.