The hashtag is laser cut from 1050 grade aluminium 1.5mm thick.
They are approx 40mm x 40mm.
They have an 8mm stamping space along the horizontal bars
Due to the laser start and stop points there is a small nobble of metal on one edge, however gentle filing will remove it.
Aluminium is a great alternative to sterling silver but they are lightweight, non tarnishing and hypo allergenic.