This is a set of three oil cups for holding painting mediums to be mixed with oil paints. The included clips allow you to attach the cups to your palette, making it easy to mix oil paints and mediums directly on the palette. It's recommended to fill the cups about halfway. These cups can also be used for cleaning brushes. Made of stainless steel, they are rust-resistant and durable. After use, wiping the contents with newspaper before washing will help them last longer. The airtight seal and convenient size make them ideal for outdoor sketching. Size: Approximately 3.8cm x 4.5cm