When inserting a needle into a medication vial, a small piece of the rubber stopper can become sheared off in a process referred to as coring. The Figure demonstrates an incident where coring occurred in the stopper using an 18G x 1.5" SOL-M™ Blunt Fill Needle (BN1815; Smiths Medical ASD, Inc., Minneapolis, MN, USA), with the rubber piece seen floating in a syringe of propofol.