Color is not claimed as a feature of the mark.
"SERIES"
The mark consists of a stylized letter "P" underscored by an arched line that is convex relative to the letter "P," and with the word "Petro" centered above the word "Formula," which resulting phrase "Petro Formula" is nestled in the empty space above the arch, to the right of the stem of the letter "P," and underneath the curve of the letter "P".
The stippling is for shading purposes only.