1994 Topps Question

[ethanbryer]

Blah.Blah.Blah, Family friend bought me a box of cards from a yard sale. Blah, Blah, Blah

Its mostly had 1994 topps and topps gold.

What I have noticed is about 3 of the Topps Base is missing the back.
Its glossy, but blank.

Anybody know what this is?

 

[011873]

Those are blank back cards. Unless you have a major star, they are worth nothing and even if it was a star, only a few bucks.