multi - blade razors are provided , having blades with differing properties . in one aspect , a razor is provided that includes a safety razor blade unit comprising a guard , a cap , and first , second and third blades with parallel sharpened edges located between the guard and cap with the first blade closest to the cap , the third blade furthest from the cap , and the second blade disposed between the first and third blades , the blades having first , second and third tip radii , respectively , at least two of the three blades having different tip radii , and at least two of the blades having different coefficients of friction .