Many of the TenPoint bows have traditional or integrated string dampening (Nitro, Stealth, Shadow, Vortec and RDX 400). The most cost effective bows in the lineup have it as an accessory option (SDS or SDR). The slip in string silencers, retention silencer, limb silencers and foot stirrup silencers have commonly been add-on accessories until recently where "whisper" versions of xbows are being offered with all the noise and vibration treatments. You will see this most commonly on xbows made in the ROC and sold here in the US.