Product compatibility: These Second Generation Pen Tips are designed for many digital models, and compatible with for pens, like PTH-460,PTH-660,PTH-860,DTH-1320,DTH-1620,DTH-2421,DTH-3221,-2421,-1660,-1661,DTH-W1320,DTH-W1620;Please take a careful check your pen model before buying. Practical: This kind of standard fine tip is sensitive and flexible to use, providing you with a comfortable writing and painting experience,without worrying about worn problem,which you work smoothly. Easy to install: Standard pen nibs are easy to install and only steps, you just need to use removal ring to get a replacement nib, and then insert into the hole, easy to operate, nice performance, you for a long time. he rich quantity can meet your , and its simple use is convenient to replace yourself. Colour:Black Material:plastic Package Contents: 10 x Pen Tips 1 x Clip Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.