Rayovac Type 10 Hearing Aid Batteries are made with advanced manufacturing technologies to ensure that you receive a powerful, consistent battery. These Rayovac Hearing Aid Batteries are offered in a 24-pack for your convenience. The mercury-free batteries are stainless steel, corrosion resistant and have a four-year freshness guarantee. These Rayovac Hearing Aid Batteries are featured in a dial pack with perforations that allow you to tear this package down to a portable, compact case with a ratcheting dial and a locking back door for added security.