Technical Pro is the first choice in quality parts for the audio engineer or sound designer that is building their own speakers. The engineers at Technical Pro know that in order to build a solid product you have to include today?s modem innovations and skilled craftsmanship for every component. There are no weak links in their chain! The BTB44R 4? Titanium Bullet Tweeter from technical pro is aligned with the concept of building a quality product with a long lasting design. The frame of the tweeter is made out of a superior die cast aluminum frame. Built in is a 65 oz. magnet and a 2? high temperature Kapton voice coil. Kapton is key here because it is a non-conductive material and is therefore not influenced by the eddy-current effect like aluminum, when situated in a magnetic gap. The bottom line is there is no mechanical resistance so you will hear a more pronounced break up when the sound rolls off. The sound will end as it is supposed to, naturally and you will hear the difference! The voice coil is Ferro Fluid enhanced voice coil. Ferro Fluid is a magnetic material which enables audio speakers to function more efficiently, with improved audio response and better power handling. If you are setting up sound for your car, building speakers or building walls of sound in your studio or home, the BTB44R is the first choice in a professional tweeter. At a price that cannot be beat, this is the go-to tweeter for serious audio professionals! Technical Pro?s groundbreaking new approach to industrial design incorporates advanced technology and striking good looks with rugged construction and a long list of features, providing years of audio enjoyment.