In a robust case containing 18 slides:
Six slides of 1 to 6 slits
Three gratings to match the slits
Diffraction grating 80 lines / mm
Diffraction grating 300 lines / mm
Single slit - Tapered
Double slit - Tapered
Metal gauze - 300 mesh
Circular apertures 1.0, 0.60, 1.40, 0.30mm nominal diameter
Hologram and 2 Polaroids