CTA Digital 3DSTP Touch Pen Set for 3DS CTA Digital 3DSTP Touch Pen Pack for 3DS. The Nintendo 3DS is the first of it's kind in handheld 3D gaming. Scribble, tap, and play your way through your Nintendo 3DS games with the Touch Pen for 3DS from CTA Digital. This stylus pack contains 4 plastic 3DS styluses, so you'll have a replacement handy in the event that one gets lost. The pen slides and clicks into the corresponding 3DS stylus slot. So with the Touch Pen Pack from CTA Digital, you'll never be without a 3DS stylus.