A razor is a bladed tool primarily used in the removal of unwanted body hair through the act of shaving. Kinds of razors include straight razors, disposable razor, and electric razors. While the razor has been in existence since before the Bronze Age ( the oldest razor- like object has been dated to 18, 000 BC), the most common types of razors in current usage are the safety razor and the. What’ s the difference between a Gillette 2- blade disposable and a Gillette Mach3 Sensitive Disposable razor? The 2- bladed Sensor disposable razor features a 2- blade array combined with the control and maneuverability of an ergonomically designed handle to give you precision and convenience.