Roger turned this bowl from a piece of 15# EZboard 2-1/2 x 10 x 10″. Here’s some more info he provided about his piece.
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“The rings were turned using a 3/16” beading tool. There are 24 rings plus the center solid. The segment lines were marked on the lathe and works perfect with the 48 segment setting on the lathe. After pencil marking them I burned them in with a wood burner by hand.