Made of plastic material of good quality to ensure a long life. Easy to open, just need to click the grip and the cover will bounce up. Easy to put things in the Plastic Components Boxes as they will opens 90 degree for easy access. Can be used for storing I.C., chip form capacitors and resistors, small screws, nuts, washers and lockwashers etc. Special designed profiles on four sides of the Component Boxesensure a secured connection with each other boxes of the same kind. With mini size, light weigh, transparent cover, the Plastic Storage Boxes looks beautiful and convenient to carry around.