For use by professionals trained in Manual Mobilization techniques * Mobilize both spine and extremities * 4 1/4" x 8" base * Latex-free * Blue in color 612 - Original Kaltenborn Concept WedgeTM For use by professionals trained in Manual Mobilization techniques Mobilize both spine and extremities Improved wedge angle and size Shown in the book 'Manual Mobilization of the Joints' 4 1/4" x 8" base Latex-free Blue in color