A memory includes a plurality of lower level bit lines, a higher level bit line, and bit line driving circuitry. More specifically, the present invention discloses a wedge type golf club head with a hydrophobic polymer coating that creates a contact angle of greater than about 90 degrees as well as decreases the coefficient of friction to be less than about 0. Each wall defines a chamber therein, and includes at least one opening extending therethrough in flow communication with the chamber. Due to this means, it is possible to suppress occurrence of a failure caused by propagation of cracks when the substrate is cut. A supplemental energy-absorbing system is connectable between opposed ends of end-to-end coupled barriers, providing energy-absorbing tubes removably inserted through each guide channel of each barrier.