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What is the difference between a Roller ball (RB) refill and a Ball pen (BP) refill?

April 26, 2017Ball BP difference Pen RB refill roller

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What is the difference between a Roller ball (RB) refill and a Ball pen (BP) refill?

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RB Refill contains low viscosity; water based ink and gives an effortless writing impression having higher ink lay down rate. BP Refill contains high viscosity; oil based ink, which is laid down more sparingly.