Magnetic kits are easy for novices to operate and leave less mess. Spilled magnetic powder is collected by letting it cling to the magnetic wand. You can also reuse the powder. Magnetic kits are great for schools and students. Use white powder for lifting prints on dark surfaces and black powder for lifting prints on light surfaces. Prints lifted with white powder are stored on black-backed cards and prints lifted with black powder are stored on white-backed cards. Includes enough supplies for at least 50 different print lifts. Each kit also includes a USB disk with 2 different FBI Fingerprinting Manuals.