Sounds like a slimmed down version of the Strummer produced by Jim Dunlop.

This multipick is designed to enhance any guitar playing-be it Funk, Blues, Rock, Country or Reggae. Created for all levels of guitar playing, it magnifies the quality of the sound. "I love the uniqueness and the sounds the Dunlop Strummer creates. This changes everything. Invention is not dead" - Richie Havens

It's on this Jim Dunlop page, and that's where the paragraph above comes from.

They look vicious, five plectra welded together, but they can be used quite delicately - you can play single notes so that they are heard, but without breaking strings, which you'd do all the time if you leant that hard on a string. Great fun for strumming. It's all too easy though to play much too loudly, so you have to be careful. I wouldn't be without one myself.