Ultra Fit Metal Detectable Econopack, Per 2000 The 3M E-A-R Ultra Fit corded earplugs features a proprietary, premolded, triple-flange design that fits comfortably in most earcanals. Metal-detectable ball bearing for high detectability. These durable, corded reusable earplugs are a great choice for hearing protection in industries such as food and pharmaceutical processing. Push-to-fit products provide in-ear comfort and convenience, with the hearing protection you expect from 3M.