These large 5" diameter by 0.5" thick washers are designed for use under heavy equipment. They are also recommended for protecting shipments during transit. 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.Made in the USA