Select “custom” and make sure to let me know in advance, and I can build one with no field and include a pic of the crystal bead in the center for field creation (for example if Dream is doing fields and you want one in a magnetic capsule, and you/he prefers an image of the crystal to the capsule).
These are currently using red/green phantom ghost quartz crystal beads. Love them! I have used lab quartz and it was powerful too.
Edit: these use 8 powerful magnets, so have a very strong magnetic field.