Whisper quiet, durable, and a breeze to install, ThunderBlox are the ultimate vibration dampening and limb silencing system. ThunderBlox reduces shot noise by up to 75% with virtually no energy loss or reduction in speed versus an unsilenced bow. ThunderBlox also reduce damaging limb shock by over 30%.

# Three Models - Solid, Split and Ultra Double Split Limb models
# Quiets bows by up to 75%
# Reduces shock by 30%
# Easy to install
# Lifetime Guarantee: NAP has test fired ThunderBlox over 25,000 times with virtually no degradation in performance or build quality. NAP is so confident in this product they are offering a no-hassle, lifetime guarantee