The invention addresses the current need for selective and potent protein tyrosine kinase inhibitors by providing potent inhibitors of c-fms kinase. Preferred liners are annular cylinders containing a plurality of passages, arranged generally parallel to the axis of the cylinders, and integrated between the inner and outer surfaces of the cylinders. The wireless local area network client device scans for wireless local area networks according to the channel order. 15% by weight of carbon, preferably in the form of graphite, and the remainder of copper. The polarity of the first and second fixed electrostatic charges determines a positional relationship of the first structure to the second structure.