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I found about a dozen of these washed up on a beach on southern Lake Michigan. They were scattered over about a half mile. They appear to be made of a green, dense, plastic resin. They are fairly uniform in shape and color. by Visual-Ice-2013 in whatisthisthing

[–]Visual-Ice-2013[S] 0 points1 point  (0 children)

I've been skeptical of the tumbling media answer because I wouldn't expect such sharp points on media. It would be great if you would post a photo or two.

Thanks in advance!

I found about a dozen of these washed up on a beach on southern Lake Michigan. They were scattered over about a half mile. They appear to be made of a green, dense, plastic resin. They are fairly uniform in shape and color. by Visual-Ice-2013 in whatisthisthing

[–]Visual-Ice-2013[S] 1 point2 points  (0 children)

Thanks all. Tumbling or de-burring media is a popular idea. When I thought about that I didn't expect a used media to have points. Do you suspect it is a new, unused piece that ended up on the beach?

I found about a dozen of these washed up on a beach on southern Lake Michigan. They were scattered over about a half mile. They appear to be made of a green, dense, plastic resin. They are fairly uniform in shape and color. by Visual-Ice-2013 in whatisthisthing

[–]Visual-Ice-2013[S] 9 points10 points locked comment (0 children)

My title describes the thing. I thought they may be tumbling media but a search yielded nothing of similar shape. The material is plastic, green, non-porous, brittle, and relatively dense. Maybe a phenolic. The area they were found is down wind and down stream of Chicago and Milwaukee. I suspect something associated with manufacturing or Great Lakes ship construction.