Thanks to the composition of quartz and carbonates, grindstones from Lombardy have been a guarantee for problem-free regrinding of knives since the 15th century. With this natural model, Opinel offers another addition to the range of knives. To avoid damaging the knife, it is necessary to moisten the stone with water before use. A coarser grit is recommended for sharpening very blunt knives. Due to its size, this whetstone is practical for on the go.