There are two types of manual razors&colon; straight razor and safety razors. Shaving is accomplished with bladed instruments, such as razors. Shaving with stone razors was technologically possible from Neolithic times. Cutting hair is often done with hair clipper, scissors and razors. One of the main differences between electric razors is the shaving technology they use. Obsidian cutting knives, sickles, scrapers, drills, razors, and arrow points have also been found. This kit consisted of pebbles, knives, razors and buckles. Disposable safety razors can be sharpened using various methods. Gillette's sales rose to 3.5 million razors and 32 million blades. Kinds of razors include straight razors, disposable razors, and electric razors. Gillette is a brand of men's safety razors and other personal care products. These were followed by multiple-blade cartridges and disposable razors. Production began in 1903, when he sold a total of 51 razors and 168 blades. In 1974 he was in a number of Schick razors commercials. This stone is considered one of the finest for sharpening straight razors.