Mix Media Art Thick Stencil. Assortment: 4x 12x12cm, 2x 12x25cm, 2x 20x25cm; 0.25mm thick. Flexible and strong material. Ideal for 3D effects, spray and mix media. Stencils are incredibly versatile and inspiring tools, and these new designs are no exception. Featuring unique shapes - one round and one with a wave - they open up endless possibilities for creating diverse patterns, especially when used along the edges.