Specifications:

• Size: 40x20mm
• Origin: CN(Origin)
• warmming: before pay pls contact with me
• Use: optical instruments
• thickness: 0.3-50mm
• tempered: depend your choice
• surface: 40/20
• surface: no bubbles and hairlines
• polishing: both two sides
• Model Number: B270
• Material: optical glass B270
• material: import B270 germany
• edge: protection chamfer
• color: clear