COLORFIN-Sofft Knives and Covers. Use these artist quality knives and covers to paint, draw, and blend for new techniques and effects. The foam covers are reusable and feature unique micropore technology. This tool is perfect for use with PanPastels, water- based colors, polymer clays, and ceramics. This package contains four knives (round, flat, oval, point) and eight foam covers (two of each shape. Paints and other mediums not included. Imported.