This retractor is 5 inches, and features 3 sharp prongs.
This flexible retractor is 6 inches, and has 2 sharp prongs.
This flexible retractor is 6 inches, and has 3 sharp prongs.  ...
This ollier retractor is 8.5 inches, and has 4 prongs.   ...
This retractor is 8.5 inches.
This retractor is 9.5 inches, and small, at 1.5in x 2in.
Dimensions of the blade are 3 1/2 L x 2 3/4 W in
This retractor is 9.5 inches.
This large retractor is 9.5 inches.