SPECIFICATIONSBrand Name: HAOYUNMAChoice: yesHign-concerned Chemical: NoneOrigin: Mainland ChinaSIZE: 21X21CMfeature 1: Glass Cleaning Mopsfeature 2: Microfiber Moping Clothfit for: For ABIR WD8, For HCR-21 etcsemi_Choice: yes21x21cm Cleaning Mops For ABIR WD8 Window Cleaner Robot,Reusable Washable Clothes Rags for Washing Windows Glass Thick Moppingit is thickness mops. and only can be used for one side Only including the cleaning mops. not including the robot and others.fit for the 21cmx21cm square window cleaner robot outsize :21*21cm,  inner size :15x12.5cmplease allow 1-2cm difference due to manual measurementpackage : 6pcs / 12pcs / 18pcs cleaning mops ( choose the one you need ).