Because the brushes are on the inside of the head & staggered it allows dirt & debri to be sucked up quicker (that's my opinion). Then around the entire bottom outside there's a silicone edge which allows the head to seemingly glide over the bottom of the pool with little help from myself. I'm not even going to bother replacing the brushes on my EXPENSIVE vacuum head! HIGHLY RECOMMEND THIS POOL TOOL
Rating: [5 of 5 Stars!]