NAP ThunderBlox Split Limb. New Archery Products ThunderBlox Split Limb Model. Whisper-quiet, durable and a breeze to install, ThunderBlox is the ultimate vibration dampening and limb silencing system. New from N.A.P., ThunderBlox reduces shot noise by up to 75% with virtually no energy loss or reduction in arrow speed. ThunderBlox also reduces damaging limb shock by over 30%. The ThunderBlox rubberized design stands up to wear and tear to quiet every shot. **2 Limb Silencers**1 Set Extra Camo Face** NEW ARCHERY PRODUCTS ThunderBlox Split Limb.
