This is a hand machined needle keeper that has 20lb test (yellowish) and 200lb test kevlar (blue) or 200lb test Technora (black) thread and cord wrapped around the outside and a 3" long internal space to hold needles. It comes supplied with a variety of small and larger needles. The cap is made out of grade 2 titanium. The cap has a divot machined into one side to assist in pushing needles thru thick or stiff material. It comes supplied with an air craft cable key ring and a P51 can opener.