String King Mark 2F STIFF Lacrosse HeadBuilt for faceoffs. The Mark 2F faceoff lacrosse head was designed for the perfect balance of flexibility, durability, and strength to dominate the X. Better materials. A new hybrid plastic gives the Mark 2F the perfect balance of flex and stiffness. It flexes when you need to grip the ball but holds its shape enough for consistent performance. More control. The Mark 2F was designed from top to bottom to dominate face offs, from the shortened throat