This is the new LH-40s II lens shade for the "new" S type 40mm f2.0 AIS with Knurled Focus ring, silver or black rim.
This ships starting Sept 7th, but you may place pre-orders now.
For 40mm f/2.0 SL II S Lens with silver or black rim
Screw-In Design: 52mm Threads
Blocks Stray Light from Entering Lens
Includes Lens Hood Cap
Protects Lens from Impact