It's a metal frame lined with a silicone material—similar to flexible bakeware—that can withstand the high temperatures of powder coating. It securely holds 52 mobile components, protecting them during transport and cleaning, while masking off the area we want unpainted.
We sent a batch loaded into this contraption alongside a batch of parts taped off with good-old tape.
The verdict?
The taped-off parts were easier to deal with, less bulky to transport, and created a nicer finish.
*sigh* Back to the drawing board...