This vape has a Standard Core with stainless steel heater cartridge, but may run a bit cool. Please see our VVPS page for information on the 15v power supply with dimmer option. An O-ring is not needed, but you can add one for free. Comes with the standard kit. For help choosing stems, see our FAQ. Hybrid Pear is a soft wood and may have a reduced lifespan due to heat degradation, but is still covered under our standard 2 year warranty. This vape is also a Shorty because it's shorter than our standard vapes, which also puts it at an increased risk for heat damage to the wires and plugs.