Manufactured in the Czech Republic these pins are the most commonly used design for entomology. Our premium quality pins are manufactured from galvanized steel, to protect against corrosion, and have gold nylon heads for a professional look. Includes 50 pins of each size: 000, 00, 0,1, 2, 3, and 4. The lower the number, the finer the pin for smaller insects. The higher the number, the sturdier the pin for larger insects. The convenient storage vials will neatly contain your pins at the work bench or in your field pack, and can also be used to collect specimens of small insects, water, soil, or sand, organize small parts, beads, glitter, and other craft supplies. For the benefit of our environment, we try to reuse and repurpose when ever possible. We were lucky enough to rescue new, unused 6ml polystyrene culture tubes with snap on caps from a high school lab, and are very excited to give them new life as convenient storage vials for these pins! Each tube contains 50 pins. There are 350 pins in each variety pack. This packaging is available only while supplies last.