my sister is an artis, she told me that it is for pencil tip shaping. if you wanted like a wider, flat line for a picture, you rub the lead on the sand paper to make it flatter, and then draw with the flat part of the pencil tip. It can also be used for sharpening, but I wouldn't recomend it.
johnfcthree Reviewed by johnfcthree on . artists i bought a thing for drawing sketches...there is a little board with sandpaper...and a weird cone/joint thing...can anyone tell me what these are for? Rating: 5