Design: Sickle curettes are dental hand instruments designed for the removal of calculus and plaque from the surfaces of teeth and below the gumline. The “13S-14S” likely refers to specific designs or variations within the McCall product line. Working End: Sickle curettes typically have a sickle-shaped working end with a pointed tip. This design allows for effective removal of deposits in the tight spaces between teeth and along the gumline. Material: Dental instruments are commonly made of high-quality stainless steel or other materials that are resistant to corrosion and can withstand the sterilization processes necessary in dental practices.