Never used.Just stored.High quality.Sturdy build.Excellent protection for your hearing aids.Lightweight and easy to carry around.Both black ones are hard shell cases with zipped closure.The large black one is spacious so can store other items like pills sprays etc when travelling. The silver one is plastic with green suede lining and comes complete with a cleaning brush.It has a small mark on the outside(as seen in pic) which is probably imprint of the instruction sheet during storage..It clicks shut.