Clarity Summer Hypo-allergenic Bass Rosin by Super-Sensitive and made from a synthetic hydrocarbon resin and produces a clear string response. It also has a hydrophobic property which resists humidity and is non-corrosive to instrument varnish. The rosin is wrapped in an attached cloth and comes in a plastic container with lid. This "Summer" rosin is abit less sticky than the "Winter" grade. Made in U.S.A.