A fully interlocking hand punched jigsaw piece cut from 1050 grade aluminium either 1.2mm, 1.5mm or 2mm thick or 1.2mm brass and copper
They are approx 30mm x 40mm.
Filing and buffing may be required if the blanks are supplied unfinished.
Laser cut jigsaw pieces can be found here
The blanks are cut individually by hand using a punch, therefore the sizes and weights are approximate