PinMart Medical Laboratory Scientist MLS Lapel Pin Available as a single item or bulk packed. Select your quantity above. 10 Pack of Lapel Pins This classic Medical Laboratory Scientist (MLS) lapel pin is jewelry quality with gold plating and cloisonn hard enamel colors. The pin design features the familiar red cross and gold caduceus. SIZE: 1" Each pin comes with a clutch back and is individually poly bagged.