You may cast 3g. Ultra light weight 2.5mm deep super shallow tuning spool for Shimano 16Aldebaran BFS. CNC machined ESD extra strong duralumin spool with titanium center shaft. 32mm dia. 4.50g. Stock spool weight is Aldebaran BFS spool 7.2g. Not for 17Conquest BFS or 17Scorpion BFS. Please insert pinion peek bar accompanied to pinion gear.