The smallest map pins allow you to locate more map pins on the crowded areas of the map.
These map pins / tacks come in multiple different colors, and are packaged 100 map pins per box.
We use the manufacturers size description of 1/16" head, but they are actually a little bit bigger...about 8 lined up in a row measure an inch.
Made by the Moore Push Pin company which sadly closed their doors after over a 100 years in business in 2019.