These water soluble wax pastels are very easy to use. There's a good range of colours in this set of 40. They are very smooth to apply, and the pigment load is dense, which means the colours are rich and intense. If you want to change how you've applied them, you just remove that area with a brush or rag soaked in water. It dissolves completely. If you want a watercolour effect, just smooth over the applied pastel with a wet brush. I love how they work with acrylics and watercolour, and am so glad I invested in them.