Wolfram RC's 2 Gram, PURE TUNGSTEN, .05mm Rectangular, 20.0mmx10.5.0mmx.05mm, AND the Square, 14.5mmx14.5mmx.05mm, "Wolf Weights"...for the single most effective low center of gravity ballast, stick them on the front for more traction or the rear for more traction, these self adhering "Wolf Weights" will make your car handle like a "Wolf in sheeps clothing!