Mercer Duck Slicer Millennia: Building on 30 years of innovation, Mercer is highly regarded and synonymous with quality: These kitchen staples are primarily used for cutting through thin or soft bones, or through hard vegetables such as squash, where twisting may chip or shatter a slicing blade. Blades made from stain-free German steel for greater durability. A variety of sizes are offered to meet the needs of almost any kitchen.