Fit for PT 31-40. High quality and long service life. Easy to install. Material: copper + ceramic Color: white, copper color Package includes: 40 x standard size copper tips 40 x standard size copper electrodes 40 x ceramic rings 8 x ceramic cup Only the above package content, other products are not included. Note: Light shooting 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 +/- 1-3 cm.