COLORFIN-Sofft Covers. Use these artist quality covers with your Sofft knives to paint, draw, and blend for new techniques and effects (Knives not included). The foam covers are reusable and feature micropore technology. Great for use with PanPastels, water- based colors, polymer clays, and ceramics. This package contains ten round foam covers. Paints and other mediums not included. Imported.