Just  a poor and bad copy of original
Those heads look exactly the same as the genuine for half the price but the quality is very bad. They last about 3 month and the grid metal looks a very poor quality. One of them broke and a cutter went trough and wounded  deeply my skin.... Those things ARE NOT OEM, just a poor and dangerous  China made copy.<br />I replaced those craps with Original that are working fine....
Rating: 1 stars