GU18 Ferrite Cores
AL=2000±25%(nH/N^2)
"E" core size(mm): (the 3rd picture)
A: 18.0±0.3
B: 15.2±0.3
C: 7.3±0.2
D: 2.95±0.25
E: 3.85±0.2
F: 5.45±0.3
G: 4.45±0.2

5SET =10 ferrite halves + 5 bobbin