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| American back cover | Orange square back cover | Blue round back cover | Green round back cover |
| 3CC | M3CCF-O | M3CCY-B | / |
| 5CC | M5CCF-O | M5CCY-B | / |
| 10CC | M10CCF-O | M10CCY-B | / |
| 30CC/55CC | M30CCF-O | M30CCY-B | M30CCY-G |
| When storing and transporting the gel for a long time, the tightly fitted back cover can isolate the air to ensure the safety of the gel. | |||