The MDF Trmner Hammer > Light > HDP Handle (aka Tromner or Troemner) is a versatile 4-in-1 dual mallet-type reflex hammer designed for eliciting myotatic and cutaneous responses in adult and pediatric patients. The ergonomic HDP handle lends the hammer a lighter weight while providing the user with greater control during percussion. This updated design is based on the classic reflex hammer invented by Ernst L.O. Trmner, MD, a director of the Neurological Hospital at St. Georg and professor at the University of Hamburg. Head: The balance-weighted chrome-plated zinc-alloy head is outfitted with large and small mallets constructed of soft TPR for precise tendon percussion. Handle: The ergonomic lightweight HDP handle is precisely balanced for increased control of percussion force for eliciting myotatic reflexes. Babinski Tip: The pointed Babinski-style tip at the base of the handle elicits superficial or cutaneous responses, including plantar and abdominal reflexes. Brush: The built-in brush at the base of the handle can be easily removed to elicit cutaneous reflexes. Warranty: Lifetime.