【Proven Durability and Quality Assurance】 Professionally tested for abrasion and cleaning, these grounding pillowcase maintain good conductivity and durability even after 10000 rotating speed abrasion tests and 1000 cleaning cycles. This emphasis on durability and quality assurance underscores the seller's commitment to providing reliable products and services, ensuring customer satisfaction and trust.If you have any installation issues, you can through the contact information on the product packaging, and we will provide 7*24 hour online service. 【Ease of Use and Safety Assurance】Setting up the grounding sheets is easy; users can snap one end of the grounding cord onto the sheet and plug the other end into the ground port of a wall outlet. The grounding cords are equipped with a built-in 100k ohm resistor, ensuring safety in case of electrical shorts. The tear-resistant material of the grounding cord adds to the safety and durability of the product. 【Premium Material】The grounding pillowcase is made of a mixture of 90% cotton and 10% silver fiber. The end of the pillowcase adopts an envelope style design, which remains in place and fixed throughout the night. Comes with a grounding wire and testing pen. 【Maintain a healthy state】 When connected to the Earth's natural electron current, users may experience positive health benefits, including deeper, better quality sleep, reduced stress, increased energy, improved circulation, and reduced inflammation. Suitable for users of all ages, including pregnant women and infants, especially for those experiencing poor sleep quality. 【Instructions for Using Conductive Test Pen】The test pen is only used to test whether the product contains silver fibers and is not used to test whether the ground wire is connected. Even without connecting the ground wire, the tail light of the test pen will light up, proving that our product contains conductive silver fibers!