The old wood spar markers could weigh 250lbs after getting water logged. The old tapered spar markers were a 14'x8"x8" timber at center, and could really bash in a boat's hull. The new pvc tube spars, about 8'x 6" diameter, weigh maybe 10lbs.
It could be that boaters have learned through observation that hitting one of the new spars will not do any damage to a boat hull.
The new pvc spars have enough flotation inside to support a swimmer with his/her shoulders out of the water, sitting on it bicycle style.
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... down and out, liv'n that Walmart side of the lake!
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