Haze has done the unheard of and designed the Square so we could replace the Heater Coils ourselves! This two-pack of Heater Coils are made of a titanium alloy and can easily be replaced with a pair of tweezers, without sending your Haze Square in for service. If your coil breaks or wears out, these Heater Coils will have get you back to vaping in no time.