Specifications: Material: PP plastic Size: Outside dimension:17.8 x 4.4 x 2.3cm Inside dimension:17.5 x 3.8 x 1.9cm Material Thickness: 1.6mm Polypropylene material advantage: --Non-toxic, light weight, not easy to break. --It has high heat resistance and can be used continuously at temperatures of 110-120℃(230℉-248℉). --Almost no water absorption, no reaction with most chemicals. --Good electrical insulation. --The transparency of polypropylene products is better than that of high density polyethylene products. Defect: --Low temperature impact strength is low. --Poor coloring. --Flammable. Tips:For material properties, please select a storage container according to the purpose. Product Feature: --High quality PP plastic,Non-toxic,moisture proof, dustproof,sturdy and durable. --The items stored in the box can be clearly seen for easy finishing. --Ideal for use as a pen case or for storing makeup brushes. --Can also be great for organizing small items,small parts,crafts, beads, coins, jewelry and others. --You can number each box, which will greatly improve the efficiency of your work and study. Package included:2 x plastic box Please note: 1.Because of the difference in measurement methods, please allow 1-2mm error, thank you for understanding. 2.If you have any questions about the product, or if the item you received is damaged, please feel free to contact us and we will respond promptly.