These are SD cards of multiple varieties for your SCSI2SD. They are high-quality and fast-speed, not Class 4 but Class 10.
They aren't just bare cards, we additionally format and set them up specifically for your sampler.
SCSI2SD: SD cards are formatted for your specified sampler/host. For v5.x, we put the ID in the areas we feel best, unless you send us a XML file of the setup you desire.
ZuluSCSI: We include the proper image files for your specified sampler and set them up for you.
SCSI2SD v6.0 / ZuluSCSI v6.4: These contain the configuration on the SD card itself, and operate identically.