Sold by the foot. For long draws where you want as little resistance as possible. Technical Specifications: 1/2" line provides .025 lbs of restriction per foot. Ideally pounds of resistance should equal pounds of applied pressure. 1/2" line holds 1 1/3 of an ounce per foot. Made from PVC. Quantity ordered will be shipped as a single uncut length. Maximum length available is 100 ft.