Machined from solid brass. Slight difference in size of sprue former allows you to select the size that more closely matches your wax injector nozzle making it easier to maintain contact between the mold and nozzle.
# 9 Sprue Former
is 9mm (.35") high and tapers from 3.3mm (1/8") to 11.5mm (.45")
# 10 Sprue Former
is 10mm (.39") high and tapers from 3.3mm (1/8") to 14mm (.55").
Matching rods are included and measure 3mm (.118") diameter by 50mm (approx 2") long.
Sold in packages of 10.
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