Cant speak for those in particular, but any type of salt will attract deer in the spring and summer.

Biologists recommend calcium and phosphorus for a proper mineral site, not only salt. Just be sure to read the label.

Oh, and here is a link for help on using them effectively. http://bioplots.com/deer_mineral_guide.html

The guide is written primarily for my products, but they should work for any attractant that uses salt.