Insulated nylon material is strong and light. When you try to reduce weight or need it to be non-conductive, such as isolating or tightening PCB, using carbon fibers, etc, make these components suitable for application. Features - Color: Assorted color. - Material: Nylon and ABS. - Size: 19.50 x 13.00 x 4.00cm/ 7.66 x 5.11 x 1.57 inch. - Made of insulated nylon material which are light weight, good insulation, no rust, no corrosion, portable and durable. - They have rust resistance and excellent oxidation resistance, which can ensure long time using. - Our products are not only well made but also great than others in the market! - A diagram inside the storage box corresponds to the every compartment with labels know what size each part is and where to get the box. - Meanwhile, it comes with an extra plastic case for your storage and carrying! Package list: 150 x nylon round spacer standoffs