Frame Block Outline Fret Inlay Sets make a nice change of pace from the usual block sets.
Also very nice when putting another smaller inlay inside.
These look good in a Rosewood or Maple fretboard with the inside filled with black epoxy and perhaps a nice small inlay or a dot in the corner.
Traditional block style inlays are sized as shown here;
1st Fret, 23mm Wide X 26mm Tall
3rd Fret, 24.5mm Wide X 25.5mm Tall
5th Fret, 27.5mm Wide X 20mm Tall
7th Fret, 29.5mm Wide X 18mm Tall
9th Fret, 31mm Wide X 15.5mm Tall
12th Fret, 33.5mm Wide X 11.5mm Tall
15th Fret, 35mm Wide X 9mm Tall
17th Fret, 36mm Wide X 7mm Tall
19th Fret, 37mm Wide X 5.5mm Tall
21st Fret, 38mm Wide X 4mm Tall