Specifications:1) Type one: WAL1a) Tungsten content: 99.92%b) Applications: high temperature and impact resistant filament, double screw filament, grid cathode, folding filament and twist tungsten wire2) Type two: WAL2a) Tungsten content: 99.92%b) Usage: common filament, heating wire, grid cathode, tungsten wire and tungsten heater3) Diameter (um): 5