Solid core or Hybrid?  Choose a solid metal core made of Stainless Steel or Titanium. Hybrid, which is referred to as the Ruby Twist , is made of Titanium and includes 230 gem cut ruby for extra heat calories!  Simple, straight forward, low maintenance and at unbeatable price.  This kit includes everything you need but a bubbler.   Includes: Crossing Technology PID 20mm Coil with Handle Thermal Twist Injector Core. The Hybrid is Titanium and also includes 230 gem cut ruby's.   Coil Heat Guard Glass Bowl with Passthrough and 14mm Female to 19mm Male Adapter Coil Heat Stand Herb Scoop Wood Brush Hybrid Titanium Matrix Injector (CT7)- includes both 14mm and 19mm Male Posts Optional Glass: Cell Cell Mega Orb V2 Orb V3 If you are looking for the microdose (adjustable diffuser bowl) it can be purchased separately here.  This is a great option for glass lovers! Please note that this kit will come assembled and it will be burned off. This so you don't have to smell the burn off all of the factory oils before you start using this. This will change the coil color but that would have happened after your first use.   CAUTION Notes! (Thermal Twist)1. Do not leave the Housing head in the glass bowl to heat up. As it heats the metal and glass expand and the housing can become stuck in the glass which can cause the glass to break. 2. Always use the provided stand for storage, do not store the housing installed on the bowl as over time this can damage the bowl.3. Please note the temperature is set to Celsius if you are in UK, EU or AU and Fahrenheit if you are in US or Canada by default.4. Please ensure the hex bolt on top of the housing is tight and secure, these can loosen during shipping. 220V coils available upon request.  Just leave instructions in order notes.  Also we may be able to swap the power cord from the normal North American cord.  Just ask.   Demo from our friend Lee @TTB!