This storm collar is designed for use with 7 3/4" chimneys and has an outer diameter of 14 3/4". with 2" rise It is made of galvanized material and is suitable for use in stove and chimney pipes, fireplaces and stoves, as well as heating, cooling, and air systems. The item package includes one storm collar, and it does not require batteries or come with batteries included. Despite being lightweight at only 0.16 ounces, this storm collar is durable and not discontinued by the manufacturer.