Swiffer Sweeper Wet Mopping Pad Refills for Floor Mop with Febreze Lavender Scent, 12 Count (Packaging May Vary)

how do these wet swiffers work?

I don't understand how to attach these. you need to open the sides and then there is no where to attach the sides otherwise i love them please how to

How big are these?

do i need a special handle or will any swiffer handle work? Thanks