A piezoelectric actuator includes a supporting substrate, a main body having a first piezoelectric laminate, a second piezoelectric laminate, and a displacement portion, and a first elastic layer. The first nip decreases in length in a recording-medium transport direction from a central area toward opposite ends in an axial direction. Integral interior magnets also apply magnetic therapy to the foot within each shoe. This method overcomes the challenges and difficulties encountered when attempting to make an eight-point star design from diamond, triangle, and square geometric shapes. The invention also provides for therapeutic compositions as well as a method of blocking blood vessel growth, a method of promoting neovascularization, a method of promoting the growth or differentiation of a cell expressing the TIE receptor, a method of blocking the growth or differentiation of a cell expressing the TIE receptor and a method of attenuating or preventing tumor growth in a human.