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For all international orders, please read our FAQ page.
The big stir bar generates stronger stirring action, good for stirring thick ink like acrylic ink or mixing metallic powdered ink, the small stir bar generates smoother action for stirring light ink. When the stir bar jumping inside the bottle instead of spinning quietly in the middle, this indicates the speed is too fast. Turn the thumbwheel to the left to slow down the spinning speed, or turn it off and on again.