Sorbothane vibration isolators are versatile spacers that can be used as feet, stops and protectors in many applications. The unique Sorbothane urethane is a durable, resilient, polymer that provides outstanding vibration isolation and non-skid properties. Sorbothane isolators help absorb impact and noise and have excellent resistance to aging; they will not harden or crack over time. They feature a smooth, clean, black urethane surface. Use them on any audio and electronic equipment to prevent skipping and interference. Caution: This product contains plasticizer which may cause minor discoloration to wood, plastic, composite and other materials following prolonged contact.