One piece molded composite body for improved durability- CeramicSpeed trademark low friction ceramic bearings- Patented ADR technology (Active Debris Remover)- CeramicSpeed Signature tooth design- Purpose specific upper and lower pulley shaping for chain control and consistent performance under load- Stainless steel, derailleur specific dustcovers for superior bearing protection - no extra spacers required- Visible ADR logo reinforcing the identity of CeramicSpeed's patented ADR technology and visually unifying the ALPHA Pulley Wheels family across sizes- Straight forward installation with embossed directional arrow and outward facing CeramicSpeed logo