Forten the Worm (2x) Black by Forten. $6.06. Offering a variety of fun colors Forten's The Worm surrounds strings to provide optimum string vibration dampening. This one-of-a-kind dampener helps fight against arm discomforts so you can concentrate on your game and not pain. Length: Approximate 4. Quantity: 2 per pack. Benefits: Reduces racquet vibration. Fabric/Material: Silicone Composition.