5 sizes for you to choose from: Our stainless steel insect repellent needles come in 5 sizes with the same length, approximately 40mm, but different diameters, 0.32mm, 0.38mm, 0.45mm, 0.56mm, and 0.71mm, respectively, for different insects Durable and reusable: The sample needle is made of stainless steel, which can reduce rust and improve the preservation effect of the sample, making it an perfect choice for long-term use Widely used: suitable for collecting and making most small, medium, or large insect specimens, with stainless steel pins used to maintain strength Protection: It is equipped with sturdy and safe plastic bottles, which can maintain the order of the pins, prevent pin loss, and effectively store the pins Large quantity: the package is equipped with 500 Entomology pins, enough for insect collectors, insect enthusiasts and even school laboratories to use for a long time Contains: 1#, 2# ,3#, 4#, 5# each one tube of insect needles, 100 per tube Colour:silver Material:Stainless steel Size: 4cm Package Contents: 500 x insect pins Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.