The Bayer Contour test strips are easy to use. The strips are made from plastic and coated with 1 layer of enzymes. These enzymes can either be glucose oxidase or glucose dehydrogenase. Once a drop of blood is placed on the end of the glucose test strip, insert the strip into the glucose monitoring system. The monitoring system will then send these electric currents, if you will, through the strip which will then enable it to read the exact sugar level in the blood tested.