At Acopa we use only the highest quality materials available. Special attention is given to the most bombproof construction techniques possible. Acopa RS rubber is designed to yield the most desired properties in climbing rubber. After years of testing, RS has proven to be as sticky as any rubber on the market but with one important advantage - feel and sensitivity. While many types of rubber excel at high load friction moves, they fail miserably when required to perform lighter load "touchy" type moves. RS rubber excels at both ends of the spectrum. Oh, in case you were wondering, RS stands for "really sticky."