The MSA Safety Mounting Ear Muff, model number 10087429, is designed for left and right use. It is a high-quality personal protective equipment that offers comfort and protection for the ears in various industrial settings. Its durable construction and reliable brand reputation make it a trusted choice for those in need of ear muffs for their work environment. With the option to use on the left or right ear, this product provides flexibility and convenience for users seeking reliable ear protection.