[Az-Geocaching] Garmin Mapource US TOPO question

Does anyone have this product?

If so, could you let me know what the contour intervals are? I was looking
online to possibly buy this for my new GPS and I see they are 1:100,000
maps, but I cannot find anything mentioning what the contour intervals are.

The online map viewer seems to be set at something like 163 foot elevations
and I wondered if the maps were the same.

Thanks in advance.

(yes, I tried to call, but they are closed for the day :))