The company's principal activity is to design, manufacture and market foot and gait-related biomechanical products. the company applies scientific and quantitative methods for the diagnosis and treatment of foot and gait-related problems. the core product of the company is a custom-made, prescription orthotic device known as foot orthoses. foot orthoses are contoured molds made from plastic, graphite, leather or composite materials. these are placed inside the patients' shoes to correct the abnormalities in their gait and relieve symptoms associated with foot or postural malalignment. the other products of the company include ppt products and pediatric counter rotation system. ppt is a medical grade soft tissue cushioning material. it provides protection against forces of pressure, shock and shear. during may 2002, the company acquired the net assets of benefoot, inc. custom orthoses accounted for 86% of 2001 revenues; Ppt products, 10% and ma