Rainbow cartridge 510 thread C-cell cartridge 0.5ml 1.0ml capacity

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Rainbow cartridge 510 thread C-cell cartridge 0.5ml 1.0ml capacity, welcome OEM.

1) Different color and cartridge capacity option.

2) Can do customized oil intake hole like 2.0mm, 1.8mm, 1.5mm and so on.

3) Lead free proven is available, we have the test certificate.