3M(TM) Metal-Out Cushioned Static Shielding Bag 2120R, 16 in. x 11 in., 100/Pack ^ 3M(TM) Metal-Out Cushioned Static Shielding Bags 2120R protect devices from physical damage as well as provide proper static shielding. The open-cell cushioning structure provides physical shock protection even when punctured. This system offers a more convenient packaging method than two-part packaging systems.The five-layer construction of the 2120R protects against direct discharge, triboelectric charge and static fields. The inside layer, next to the components, is a smooth static-dissipative polyethylene liner that minimizes snagging of pins or sharp edges during insertion or removal.