The Riley ASI HD-400 2 Piece Ash Snooker/ Pool Cue With 9.5mm tip. Comes complete with Anti Shock/ Impact Grip Section, WAC System, Spiral Brass Joint System Precision machined brass cue joint, Varying Decalised Design & Riley Butt Cap.ASI Grip System Anti Shock/ Impact The new Anti Shock/ Impact System allows for a smoother, more controlled feel every time you strike the cue ball. With the new ASI Grip, shock & impact (vibration) is signifincantly reduced during play. If you want the ultimate shock absorber try the ASI grip system.WAC System Weight Adjustable Cues Customise your cue using WAC Technology. Wac means that you can adjust the weight of your cue to suit your individual playing needs. All WAC cues have 3 weight rings integrated into the butt section of the cue. Each weight ring weight 1/2 oz (14 grams) & can be removed or added to create the desired weight for the individual player. With weight & balance being the variable factors, WAC technology has been carefully engineered to bring the centre of gravity forward to its optimum position. The balance & centre of gravity are key features in the manufacture of professional quality cues.