Infinity Kappa Perfect’s design is inspired by motorcycles & the rider culture. The Kappa Perfect coaxial models tweeter is smart removable design, which will offer you the component upgrade based on riders listening preference by using the included tweeter installation kits. Engineered for motorcycle applications, we selected the 1" Sulfide-Dome in an Edge-driven design for perfect sound. Lightweight Basalt fiber combined with Harman's Patented Plus One technology, which not only bring the sound accuracy, but also increase the loudness. Neodymium magnets provide higher efficiency power in small size while reducing their weight making them idea for motorcycle applications.