Do you have a concern about abilities of our laser? If you have a concern about abilities of our laser, please let us know. If you are not sure that our laser can cut some material or engrave on some material please submit this form Laser type2.1W diode laser3.5W diode laser5.6W diode laser8W diode laserYour name(required)Your email(please, enter a valid email)What do you want to cut or engrave? Type your all concerns here.We ship as soon as you pay the invoice. If you are not certain we can also make you a special refund condition. It means that we can ship you the laser and you may try to cut or engrave on something and if it does not fit, you may send it back and get 100% refund.