The present invention provides an anti-microbial composition comprising an antimicrobial agent with surfactant properties; a siloxane selected from those having the formulae SiO2nSi3, and SiOHnSi3, and mixtures thereof, wherein n is from 1 to 24; and a polar solvent; wherein the ratio of to is from about 100:1 to about 5:1. The end-capped prepolymer blocks are preferably difunctional or trifunctional. The pattern structure comprises a flat second upper surface that is higher than the first upper surface. The second shaft is configured to rotatably connect with the engine.