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Monster markers are the very best marker available, equipped with 30mm tip & the flow valve, You can fill them with any ink or paint you want. The marker is very easy to refill, just unscrew anti clockwise , you can refill these markers as many times as you like, refills & replacement nibs are available in store now.
Monster Sick Ink is rapidly gaining the reputation as the highest quality stainer /ink on the market, extra nasty comes in a extra large 250ml bottle, with secure screw on lid, leaves its mark on all surfaces super permanent so be warned its sick.