Most Popular 4-woods Played on Tour

Which 4-wood brands and models are the most popular with the pros?

Most Popular 4-wood Brands Played on Tour:

Brand # of Tour Players
Callaway 1
Titleist 1

Most Popular 4-wood Models Played on Tour:

Model Name # of Tour Players
Titleist TSR2+ 1
Callaway Mavrik Sub Zero 1