I don't know much about these, except that I believe they are for Filters/Diffusers for Studio Spot Lights or and/or Barndoor Lighting (stage lighting).  I got them as part of a storage unit buy out that had a lot of DJ and professional lighting and media equipment.

They appear to be very similar in size and shape to the Cool Lux CL1000 line of lights.  Please see measurements above (24.5 cm square/9 and 9/16th inches square).

They are made of plastic and/or resin.  Clean, no scratches or flaws of note.  Lightly used, but clearly not overly used.

The come in a soft vynil carrying case with 6 pockets for storage and transportation.  The Carrying Case is branded "Cool Lights" and 6 of the 8 filters are as well.  Aside from they carrying case, you get:

2 clear filers, rough pattern on one side, smooth on the other.  Smooth back side still has a thin film of plastic that easily peels off.  I am thinking these have never been used.

1 "pink" filter marked "Cool Lights LED600 Filter 1/2 Minusgreen".

1 "orange" filter marked "LED600 FULL CTO".

1 "pink" filter marked "Cool Lights LED600 Filter 1/4 Minusgreen".

1 "pink" filter marked "Cool Lights LED600 Filter 1/2 Minusgreen".

1 "orange" Filter marked "LED 600 Full CTO".

1 "pink" Filter marked "Cool Lights LED600 Filter 1/4 Minusgreen".

OK, so it looks like there are four colors/filters styles, and you get two of each for a total of 8.

I don't know much about these, so please view pics for more info or ask me questions.

I ship fast and with great care from NJ!