They all use one of three different machines and all produce to the same specs. Concrete pavers are a commodity, so go with whomever produces the color you want, has good service, and competitive pricing.
Richie, I can tell you from personal experience that Borgert Products makes the best favor I have ever found. They tested highest and density, contraction and expansion and performance of any material I researched and have used. They're not cheap, most of us don't want to be installing please things more than once. They are landing airplanes on these things for Pete's sake!
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