| 摘要 |
<p>In the present invention, tips for ball-point pens, roller ball pens or gel ink roller ball pens 1, comprising a ball receiving part (1a) and a ball (2) are characterized in that the material of the ball receiving part (1a) is a ferritic stainless steel material which does not contain a lead component as a free machining material and which contains bismuth (Bi) and sulfur (S) as the free machining material and thus, toxicity by the lead component is eliminated, and a machinability required for the ball-point pen tip is realized.</p> |
