Each Tonareli Fiberglass Shaped Suspension Viola Case begins with it's own mold. Tonareli uses fiberglass sheets that are placed inside each mold and are then coated with thermal resin. The mold is sealed and hardens the fiberglass into the cello shaped case. The completed fiblerglass product provides a string and lightweight, durable case with excellent thermal insulation. Once you case is closed and sealed you have the comfort of knowing your instrument is not only protected from inclement weather but also form sudden changes in temperature. Tonareli thought of every last detail with this new design, including a bow holder that will securely hold two bows and a removable accessory compartment for rosin, strings, mutes and your cleaning cloth. Each case comes with two shoulder straps and a blanket.