X - Factor Supreme Crossbow System. Noise vastly reduced! No more spooking game from your crossbow shot. Finally a tested System for split-limb crossbows that really does make a drastic difference in sound and vibration. Yes, it reduces noise levels by as much as 38 decibels, and up to 30% vibration reduction on today"s crossbows. Life is good! Be dead silent, order now! X-Factor Supreme Crossbow System