Spirit Carriers are certified vegan and have been developed to improve the quality of "burns" on thermal style transfer machines by evenly spreading thermal energy over the entire SpiritÄ Thermal Stencil Paper.
Many old machines- like the 3M Secretary- develop hotspots as they get older; Carriers have been proven to reduce over- and underexposure on these machines, allowing tattoo artists to get even and clear stencils every time.
Always use a Spirit Carrier on thermal machines.