Barber's Sharpeners are a type of tool used to sharpen straight razors. They are also known as strops, which is a term derived from the Dutch word stroppen, meaning 'to sharpen'. Barber's Sharpeners are typically made of leather and are used to hone the blade of a straight razor, giving it a sharp edge. The leather is usually treated with a lubricant such as oil or wax, which helps to keep the blade from becoming dull.