The phrase "horizontal bands" refers to lines or stripes that are parallel to the ground and run horizontally across a surface or object. Full definition
They invite you to enter a pictorial space with horizontal bands of cool sky above and warm earth below. (art.newcity.com)
When you look at the specs, you will notice that it is a fairly standard horizontal band saw. (geekwrapped.com)
Over these markings, painted horizontal bands of alternating color create a measured composition suggestive of a musical score. (phillips.kimbellart.org)