The BNM7 is a marking strip accessory used for identifying terminal blocks. It is constructed from PVC with a glossy surface and measures 1000 mm in length, 9.5 mm in width, and 0.5 mm in thickness. Each strip has an approximate weight of 7.2g and is supplied in a package of 10. These marking strips are used to label various models in the BN-W and BNH-W series terminal blocks, aiding in the organization and identification of wiring in electrical panels.