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This review is from: OXO Good Grips Shower Stall Drain Protector (Kitchen & Home)
Not the cheapest product available, but certainly the best.
This is a circular protector with an outer rubber, and is really only suitable where there is a recess in the shower in which it can sit. Without a recess it'll float off, but with one it works perfectly. Keeps shower running well and very shiny. Worth the money for sure.