The Nevi scalers were designed by Hu-Friedy in collaboration with dental hygienists. They include the Nevi 1 for anterior teeth with a disk end and sickle end, and the Nevi 2 for posterior teeth with a curved sickle end. The Nevi 3 and 4 were later introduced for posterior teeth removal of tough deposits, featuring ultra-thin blades and contra-angled bends for improved access and ergonomics. The Nevi scalers are designed to be thin and strong for interproximal cleaning with an ergonomic grip to reduce hand fatigue.