CU4R4 Hard Cases. The CU series carry cases are made of three-layer, extra-hard EVA, covered with an exterior of high-density oxford cloth, the custom foam inserts are designed to fit Xvive wireless systems perfectly, so your wireless units won’t rattle around during transport. Product Features: Hard carry case for the U4R4 In-Ear Monitor Wireless System (with four receivers) Three-layer EVA hardshell case High-density oxford cloth exterior Scratch-resistant, tear-resistant and waterproof Custom foam insert designed for the U4R4 system Includes interior pouch for USB charging cables