60s cobalt blue and white swirll lucite bangles by Best Products in Rhode Island. One measures just under 1/2" wide with 2 9/16" wrist opening and 3/16" wall thickness. The medium size measure 9/16" wide with 2 9/16" wrist opening and 1/4" wall thickness.
Shown with a contemporary wide cobalt lucite bangle with white pearlized dots measuring 1 1/4" X 2 9/16" X 5/15" wall thickness. See LG149