You may cast 0.6g. Made of Magnesium-titanium alloy! Ultra light weight shallow tuning spool, 3mm deep spool for Daiwa 19 Steez Air TW, 20Alphas Air TW, 21Gekkabijin Air TW, 22Silver Creek Air TW, 2023 Millionaire Stream Custom Air. 28mm dia. 2.92g (measured without ball bearing).
Fixed brake rotor offers stable brake. SIC ball installed at the end of shaft to offer stable brake.
Brake is about 35% less than that of stock spool.