X Factor Xtreme TAC SBT Stabilizer Black. The patented shock block technology of the Xtreme Stabilizer from X-Factor is incorporated into the end of the stabilizer. This allows for the first time that dampening can be added to the end of a stabilizer. The X-Factor Xtreme TAC SBT Stabilizer gives you the ultimate in vibration dampening technology giving you a smoother and steadier shot. The SBT or shock block technology starts by dampening the X-Factor Xtreme Stabilizer. As you add weight you modify the base (shock suppressor) and the butt plate (shock block terminal) to give you the desired effect. For a great way to make sure you are using one of the best stabilizers the archery industry has to offer choose the X Factor Xtreme TAC SBT Stabilizer. Package Contents: X Factor Xtreme TAC SBT Stabilizer X Factor XF-C-1720: Xtreme TAC SBT Stabilizer Black