YouTuber MajinZaku explained this neat piece of item from Gunprimer perfectly, so I'll let him do the talking:
"Whats the model that you think of when I say “joint sag”? Loose joints plagued Gunpla for a number of years, decades. Even now, 40+ years later, certain releases that would be otherwise fantastic are thrown to the back of the backlog because the polycaps wont hold a position. MG GN-X Anyone?
You run into the same issue with backpacks, side skirts, basically any moving part. Over time the issue can get worse. Gunprimer has relieved us of having to tape/paint/nail polish/putty or glue the joint by releasing a cost effective multi use solution to this problem. Introducing…JOINT GUARD. With your purchase you receive, I’m not kidding, over 1000 pieces of specially designed “tape” for lack of a better word. Each sheet contains precisely measured and pre-cut strips in multiple sizes."
Made in Korea
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