The Kow-Ball Chin Ball Marker is recognized worldwide as an effective heat detection aid assuring high conception. Made of harness leather, Kow-Ball is fully adjustable and attaches securely and comfortably to a teaser (Gomer) bull. Kow-Ball’s spring-loaded stainless steel ball acts like a ball-point pen, marking the mounted cow with a specially formulated nontoxic marking fluid. Reservoir holds sufficient fluid for 25 to 30 mountings and is easily refilled. Marking fluid sold separately.