This listing is for Astrositall CO-115M ZERODUR 120mm Telescope Mirror Blank. Astrositall is known to be ZERODUR clone produced in Former Soviet Union. The properties of AstroSitall compared to Zerodur are shown in pics. 

The blanks (we have multiple in stock) have the following dimensions: 120mmx120mmx40mm (1.3kg) truncated square and about 40mm thickness. These particular items were Sagnac interferometer blanks prepared for ring laser machining (some of them have side protectors attached). 

We have different sizes in stock (please inquire), therefore the actual weight would be different. The price is base on the actual weight ($160 per kilogram of raw material). Because of the relatively small weight the shipping would done by regular post and we can combine shipping whenever possible. Please feel free to contact for more information.

Please ask questions before bidding and bid only if you know exactly what you are bidding for.

Due to the nature of product it is sold as is with no return!

Most of the Globe expedited shipping is available except Russia, Belarus, North Korea, Honduras and some other countries. Attention: we don't ship to Russia anymore. All orders with Russian shipping addresses will be cancelled! Payment is due within 3 days.

Buyer is responsible for all local taxes and customs fees whenever applicable.

Please note: the listing is for AstroSitall blank material only! All other auxiliary items shown at the pictures are for demonstration purposes and NOT INCLUDED with this lot.

Please check out my other items! and thanks for looking