Melles Griot 10X Beam Expander.

Melles Griot 20X Beam Expander.

Melles Griot 3X Beam Expander.

30x28mm mirrored filter / beam splitter
 

Reflecting about 75% and transmitting about 25%.
Color changes between blue and gold depending on angle.
Very cool to experiment with.

Set contains: 6 colored filters (CMYRGB)
4 diffraction gratings.2- double-axis 532 lines/mm & 2-linear 1000 lines/mm.
Polarizing filter & 3 ~12 inch sections of fiber optic cable.