The Antishock Stem is designed with a two-piece construction that allows up to 2º of vertical displacement to help isolate the handlebar from high frequency vibrations and road shock. A specially engineering elastomer insert sits between the two parts of the stem and provides a buffer between your hands and road chatter. The Antishock Stem is not a suspension stem and is not recommended for mountain bike use, but will help to reduce pavement buzz and provide some relief to your hands and wrists over long rides.