The blade is white plastic. You can find them at some hardware stores. They're not always labelled UHMW, but decently thick opaque white plastic is a dead giveaway. They're snow pushers, not shovels; the geometry isn't great for lifting, but pushing to the sides is 2-3x faster and easier than any shovel and if the snow isn't heavy it's easy to lift as well.

Ice rinks and hockey games use them to clear snow on the ice because they're the best tool for the job.

Cost is $40-$80USD for a pusher.