Product specification/models Size:25(24) * 25(24)* 5~8, tolerance (length and width are ¡¨¤0.05, thickness is ¡¨¤0.02 Material: oxygen-free copper(materials can be selected:tungsten copper, molybdenum copper and diapersion copper) Surface roughness: ra0.4~0.002um Vital edge: hairless, roundness of thorn edgessmaller than or equals to 15 um Surface caoting: ni, au High temperature of coating: ni>400 degree centigrade Au:350--700 degree centigrade Application (a) industrial laser; (b) welding, cutting, marking, surface treatment(annealing) by laser machine-medical laser machine (eye-treatment, hair-removal treatment), endoscopic. Sealed package