I bought the Kaltenborn Wedge after a spinal injury and it helped me tremendously to heal. They sell new for $60, I pass it on for $20.
The details:
-Physical Therapy Wedge: Use for testing and mobilization of the spine and extremities; improved wedge angle and size allow for more effective manual therapy treatment.
-Designed by Physical Therapist Freddy Kaltenborn: Each small wedge features a molded groove that relieves pressure on the spinous process when used as a back wedge, facilitating mobilization via the transverse process while mobilizing the spine.
-Extremity Mobilization: The bottom of this triangular wedge can be used as a positioning tool for extremity mobilization.
-Durable Construction: Durable, non-slip rubber construction for effective physical therapy treatment and enhanced comfort for the patient. Unlike lookalike wedges, the Concept Wedge is made of firm rubber with enough give for user comfort