EverGreen 9511 Polystyrene Sheet Game 150 x 300 x 0.25 mm Pack of 4 Black

I removed the felt on the tube rings for my telescope and cut pieces of this to replace it. I also purchased embroidery hoops to put above the top ring so when I loosen the rings the telescope doesn't slide down. This allows me to easily rotate the telescope tube so the eyepiece is in a better spot for viewing.

This stuff works as designed and is uniform. Not much else to say about it.

These black Styrene Sheets are of good quality and work for many different applications.

I purchased this product to use in my structures to eliminate light from coming through the walls making them glow. This stuff really works.