Kief is almost entirely composed of trichomes, which are packed with terpenes and THC. Accumulating pure kief is usually the result of grinding already-trimmed whole nugs. Many consumer-grade premium quality 4-piece grinders will have dedicated kief catchers for these friction-freed trichomes. Commercial trim bins and industrial grinders also collect kief which is then either processed as hash or re-added to other cannabis products like moonrocks for example. Shake is found exclusively at the bottom of whole flower storage containers like dispensary jars.