For over forty years, Bien-Air's classic CA 1:1 and CA 1:5 electric handpieces have earned respect and admiration for their dominating productivity and remarkable durability, making them the most popular models in the lineup. These handpieces have continuously evolved, featuring a fully redesigned bur-locking and rotation drive mechanism that ensures micron-precise concentricity and stability. With a speed range of 60 to 200,000 rpm, they allow for intricate restorative work with incredible accuracy. The CA 1:1 and CA 1:5 exemplify the reliability and quality that define Bien-Air's reputation. Additionally, the patented anti-heating technology, integrated into the head’s push button, keeps the instrument’s head at a safe temperature, significantly reducing the risk of patient burn injuries. The unique push-button insert locking mechanism ensures quick, comfortable bur changes with precise locking.