Hand Held Meat Tenderizer. Contains 15 stainless knife blades. Stainless side columns. Measures 6" x 2" x 4.5". Black ABS construction with blue trim. Features removable blade cartridge for quick and complete cleaning. FDA compliant, NSF certified. Top shelf dishwasher safe. How it works - razor sharp knife blades cut through the connective tissues that make meat tough. Tiny "heat channels" are created without changing the shape or appearance of the meat resulting in faster penetration of marinades, even cooking throughout the meat and significantly reduced cooking times - up to 40%.