1.5mH Inductor - Iron Dust Bobbin.
0.75mm enamelled OFC wire ~ fine for upto 100 watt systems.
The bobbin size is approx 26mm high x 26mm diameter, core 12mm. Simple to fix to a crossover panel with hot melt glue or cable ties.
These are top quality, compact inductors as used by Heybrook & JPW.
DCR: 0.3 Ohms.