7 Sizes of Bug Pins - There are 7 sizes of bug pins for you to use. They have the same length (40mm), but different diameters: 0.27mm, 0.29mm, 0.32mm, 0.38mm, 0.45mm, 0.56mm, 0.71mm; enough to handle different items and meet your different purposes. PREMIUM QUALITY AND REUSABLE - The specimen pins are made of stainless steel to reduce rust and improve specimen preservation, which can serve you for a long time. Storage Vials - Each needle size comes in its own vial, which protects your needles from loss or mess, for easy storage and on-the-go travel. 700 Pcs Entomology Pins - Package contains 700 pcs Entomology Pins, 100 pcs of each size, enough for long term use by insect collectors, insect lovers, or even school labs. Practical Tool - These herbarium needles are a great utility tool for schools, laboratories, butterfly collectors, etc., suitable for collecting and making most small, medium and large size specimens. Colour:Silver Material:Stainless steel Package Contents: 700 * Specimen Insect Pins