Frixion Ball4" can use 4 colors properly by one, it scratches them out any number of times, and is a 4-color ball-point with possible high convenience. an ink color -- black and red - blue and green. A nib is a 0.5-mm super thin type and is suitable for the writing to fine parts, such as a notebook and data. - A hand is transparency by a temperature change! Ball-point carrying the "Frixion ink" which makes ink colorlessness by a temperature change of the new way of thinking. Since erase temperature is set to "Frixion ink", the color of ink can change to colorlessness by the frictional heat which produces a hand by rubbing against the exclusive rubber of the body rear, and it can erase a hand. - Garbage does not come out. It erases and there is little remainder. In order to make the ink of a hand into colorlessness by frictional heat unlike the pens and pencils erased with an eraser, garbage does not come out. Moreover, a pencil and a mechanical pencil erase, it erases compared with marks, and, as for the feature, there is very little remainder. - Scratch out any number of times and it is possible. A repetition note in the part which was erased unlike chemical formulae, such as ink elimination liquid, is possible. - After a hand gets dry, if it rubs with the rubber of the axial rear, a color will disappear. * It cannot be used for bonds and address writing.