This box of 50 lancets is used with the IHealth lancing pen. Lancets are small needles that lightly prick the skin to collect a blood sample. They are used with the Lancing pen to adjust the depth and strength of the sting. The drop of blood collected will be put in contact with the strips. The IHealth strip, inserted into the iHealth meter, will measure blood glucose by analyzing the reaction between the bloodstream and the test strip.