Boone Unrigged Bird Constructed of urethane foam to prevent absorbing water and features a stainless steel thru-wire construction is employed for added strength. The Boone Unrigged Bird Teaser attracts fish. It’s that simple. Each Bird is made with a stainless steel wire ‘thru wire’ harness. All you have to do is attach it to the snap swivel on your double line with the eye of the leader on the lure attached to the rear of the bird.