Material: Stainless Steel 00# length 40mm diameter = 0.27mm; suitable for small or micro insects, such as mosquito, fly and wasp 0# length 40mm diameter = 0.29mm; suitable for small or micro insects, such as mosquito, fly and wasp 1# length 40mm diameter = 0.32mm; used for smaller insect specimen 2# length 40mm, diameter = 0.38mm; used for making small or medium-sized insect specimens, such as small and medium-sized economic seven orders (Coleoptera, Lepidoptera, Orthoptera, Hymenoptera, Diptera, Homoptera, Hemiptera), etc. 3# length: 40mm, diameter = 0.45mm; it is used for the production of medium-sized insect specimens, such as moderate size economic seven orders, dragonflies, etc. 4# length 40mm, diameter = 0.56mm; it is used for making medium-sized or larger insect specimens, such as cicadas, beetles, butterfly moths, etc. with large body shape or heavy weight. 5# length 40mm, diameter = 0.71mm; it is used for making large or large insect specimens, such as giant or overweight golden tortoise, spade beetle, longicorn, etc.