Cambo 30mm recessed 162x162mm lens board Blank No hole This lens board is 3d printed, there are some marks do to the 3d printing process. The material use is PET Copolymer, 3 time stronger than ABS. It's a high quality material made in Italy with excellent mechanical property and temperature resistance (see the specs in the pictures). With normal use it is going to last a lifetime. For any question please contact me.