They are handmade from high quality materials. 14mm x 50mm and glide almost smoothly across the paper surface. You will receive a set of 15 consisting of the colours 005 white I, 105 lemon, 125 lemon dark, 147 yellow ochre light, 205 orange deep, 225 vermilion deep, 315 red oxide, 325 red brown dark, 425 cobalt blue, 427 light cobalt blue, 515 leaf green.