The insect pins Ento Sphinx are made in Czech Republic. Stainless steal with nylon head. Recommended for regions of high humidity. The number 000, 00, 0 and 1 are the thiner and fine pins; the number 2 and 3 have a medium thickness; the number 4, 5 and 6 are stronger and the number 7 is the most thickness, strong and long pin. They are used in field labs, museums, institutes and private scientific or personal collections. Each package include 100 pins per size.