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The Empty Squeeze Mop is a 2oz. soft plastic, squeezable mop with a 10mm mohair nib that marks just about any surface including concrete. It works great with both ink and paint and it comes with an extra regular nib. It's small size makes it a good mop to carry with you because it doesn't take up too much space in your pocket. You can refill this mop as many times as you want and it already comes with an extra nib, so it'll definitely last a long time.