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Since this is consumables, without which the Vileda 136135 ViRobi The wiping robot can not operate (and the one not needed without the device), a review is likely unnecessary. Nevertheless must be said at this point that they are working properly and can be attached to the unit's play. Only the price seems quite high. I therefore hope that at this point of Amazon a subscription, as it is indeed available for many products that are regularly needed again and again. Because the ViRobi Nachfülltücher - 12 x 20 boards are me too much at once.