I received the jumbo blocks. The first item was a common "old school" floor broom. Put it in the holder and it just slid down the handle until it fell to the floor. Then I tried a dry wipe, which simply slipped off and fell off much faster due to the weight. Then I tried a broom with a wood and plastic handle (the one with the 18" or 24" head). Just slide down until they touch the ground. The nib just isn't strong enough or the batch I received wasn't assembled with the correct nibs, not sure I returned it.