These hinged, rectangular containers are made of durable tinplate material, can be applied for a long time. Moreover, lightweight and durable. The round edges are smooth without burs and are seamlessly, protect your hands from damage & eliminate any risk of leakage during travel. Perfect for storing small art supplies, watercolor half pans, or our own Push/Pull Sticky Caps paints! Outer Dimensions: 2.45" x 3.75" x .9" Inner Dimensions: 2.2" x 3.6" x 0.8"