Introducing The Viper Defender Iii A Protective Foam Surround For Your Dartboard Designed To Save Your Wall From Damage From Steel Tip Darts. Its 6 Piece Construction Takes Seconds To Set Up Sliding Around Your Existing 17. 75 Or 18 Bristle Dartboard With A Snug And Secure Fit. No Need For Any Tools Or Installation Hardware. The Defender Iii Provides An Extra 5 Inches Of Protection Around Your Existing Dartboard With Its 1 Thick High-Density V-Foam. Your Darts Will Not Stick To Your Wall Or Fall Onto The Floor When The Defender Iii Is Present Saving You Hundreds On Wall And Floor Repair As Well As Dart Tip Replacement. The Attractive Velvet Surface Keeps Your Game Room Looking Suave And Professional And It Is Fully Reversible For Lasting Protection For Years To Come. Dartboard Not Included.