Very durable product [SEP] Best $20 investment. I have had these since October 2016 and it’s now July 2019. It still works great. The only thing I wish, is that it would come with an even longer attachment because for me personally the 12 mm attachment is still too short for the top of the head. I cut the back and sides  of my son’s head with these at 9mm and the top of the head I cut with scissors.