The pin and patch are made by AB Emblems the NASA Contractor for mission emblems. The pin is approximately 1 inch in diameter and the patch is 4 inches.

When purchasing mission lapel pins be sure to check the embossing on the back of the pin:

NASA
STS-107
ABEmblem.com

to make sure you are getting the NASA authorized pin from AB Emblems.

This is the emblem of he fatal last mission of Space Shuttle Columbia. The orbiter and crew were lost during re-entry.