Premium anti-vibration and vibration damping discs. The sizes range from 0.25"x 1" to 1" x 4" and have a rated load anywhere from 4.3lbs to 6,000lbs. The circular pads/discs are very versatile that help absorb impact and noise. They have excellent resistance to aging along with a smooth, clean, black sorbothane surface. Remember that softer durometers have lower weight load ratings.