If its smaller than a microwave, it's almost certainly an inkjet. Laserjet printers are mondo pricey, so you'd prolly know if it were laser or not.
As states before, don't worry about the ink rubbing off. If you do end up with any sort of smudge on the UGC, don't worry. They're made of a plastic that acts like wax paper. Isopropyl will take almost anything off that happens onto your UGCs.