PVC, It's a pipe made out of plastic; mostly used in construction for drainage, sprinklers for your lawn etc. you can buy it Home Depot. It's super slippery when you hit it; so that's why they put that on the sliders. When plastic and wet plastic meet (your board) - it makes for a fun ride. Google PVC and you will have a better idea of what it is. Hope it helped you out.
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