Devices for attaching to rock that have non-metal components and can be used for rock climbing. Embodiments include passive chocks, active camming devices, passive camming devices, and sliders. Lightweight materials used in place of more dense materials like steel result in lighter weight devices. Geometry of parts are changed to reduce weight, reduce manufacturing cost, and increase functionality. Higher friction materials against the rock allow greater expansion ranges, less stress in the rock, and increased holding power. Many embodiments have a head attached to a stem and a loop. Various embodiments feature nonmetallic tensile members, tubular plastic semi-rigid stems, polymer cams, hollow or non-metallic axles, biasing mechanisms, high-friction materials on one side or both, or combinations of these and other features.