This cleaning block allows you to easily remove residue on your bonsai tools. Acts as a unique alternative to sandpaper, emery cloth, steel wool and rubbing compounds making it more gentle on your tools. Grit easily removes sap and other hardened materials on tools. Leaves a nice shine when finished. Embedded coarse grit is perfect for polishing tools after removing large and harder residue. Simply use block like an eraser, rubbing firmly on wet or dry surface. Made in the Germany. Non-toxic.