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 bull. Kow-Ball's spring loaded stainless steel ball acts like a ball point pen, marking the mounted cow with a specially formulated non-toxic marking fluid. Reservoir holds sufficient fluid for 25 - 30 mountings and is easily refilled.