These innovative covers are sized specifically for use with Sofft Knives - ergonomic tools for innovative pastel application. These covers transform Knives into absorbent tools. The covers are specially designed for artists and crafters to hold and release the right amount of pastel color for smooth, vibrant results. These covers can also be used with most water-based art and craft materials for a variety of unique marks and effects. These shapes allow your to achieve specific results when blending, mark-making, layering and more.