Hi Hyper, the surface is a 'hybrid mixture' of silicone and rubber with bits of chomped up car tyre. Its specially designed to not harm horses joints when training and this actual flooring was used at the horse of the year event in 2004 then it got moved to where it is now. Its not dissimilar to sandy dirt and you get a blue groove type line forming pretty quikly with a sandy like line off the race line. Soft enough to get rooster tails when you get it wrong : )
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