Used to position the patient for postural adjusting procedures, to facilitate manipulation, for comfort, pregnancy, or any other reason, regardless of technique. Many doctors use these wedges as a take home alternative to SOT blocks. The 6" height works better for taller patients. Firm, durable, cross linked layers of polyethylene foam bonded to a bottom layer of non slip neoprene so blocks may be safely stacked as needed for patient positioning. Very tough. Color Gray. May vary according to availability of foam materials.