Platinum 90%, Iridium 10% tube with cap disc welded to one end. 0.250" outside diameter x 0.198" inside diameter (0.026" wall) x 1.5" long tube, with cap (.250" diameter x 0.026" thick) welded to one end.
Platinum 90%, Iridium 10% tube with cap disc welded to one end. 0.250" outside diameter x 0.218" inside diameter (0.016" wall) x 1.5" long tube, with cap (.250" diameter x 0.016" thick) welded to one end.