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Fine steel with high elastic polyester sponge head can be replaced, creating the pen cap cleaning tool. Knead gently front-end sponge reduce the volume, and then into the inside the pen cap, to be expanded to conform to the shape of the internal structure of a pen cap, close to every corner, absorption in the pen cap the residual ink, clean the cap. But also from the front end of the sponge insert steel nail head, at the front end of the straight rod is fixed, the hardness, help SpongeBob cling to the inner side of the pen cap to wipe, clean all invisible corner.