This is a very specific dental supply item: COLTENE Wedjets. They are small, flexible cords made from dyed natural latex, used in dentistry to help place and stabilize a rubber dam. A rubber dam is a sheet of latex used to isolate a tooth during procedures like fillings or root canals to keep it dry and clean. The Wedjet cord is tucked between the teeth to hold the dam in place securely. This pack is for the 'Small' size in yellow. They have excellent elasticity and are about 4cm long; you can trim them as needed. A water-soluble lubricant can help with placement. Important: This product contains natural latex, so it should not be used on patients with a latex allergy. This is a professional product for dental clinics, not for consumer use. Store in a cool place (below 25°C/77°F) and do not use past the expiration date.