Rigid Tubes are designed for high hoop strength so they are great for deer hair patterns and other patterns that use bulky materials that require heavy tying pressure. The tube material is good for all but the coldest water.Available in Lg (1/8") and Small (3/32") diameters. Small Rigid Tubes are also available with a thicker wall (TW), for greater strength and better performance in cold conditions. TW tubes are 3/32 inch OD x 5" long, 10 pk. Requires .031" Pin.