Check the listing for details. TWO 4" Prowler Planer Board Bobbers STEER IT Left-Right-POP to flip direction!. Condition: New. Listed at 18.95 USD. Prowler Planers can be weighted to go left or right or FLIP DIRECTION when given a little POP. The Package includes (2) 4" Prowlers, 4 weight balance screws (for direction control), 4 bead pegs and 4 solid brass nails. Prowler Planers are "Patented" and have 2 keels and 3 holes for the weight balance screw. Put the screw in the hole in the green keel to go left, in the orange keel to go right or in the hole on the far side (on the seam) to flip direction!Prowlers are made out of a fairly hard foam and basically unbreakableProwlers are Multi-FUNctional Planers and the #1 planer boards shallow water or if fish are near the surface. For deeper water check out the DualFin Planer that clips on after you let out line and has a release so it slides down to reel in without stopping. Use with jigs, spinners, spoons up to 1.5 oz. and crank baits up to 6" long. The weight balance screw can be put in one of the keels to keep it from flipping or on the color seam to flip direction when given a POP. Made by BulletBobber Enterprises under US Patent #6,271,874