Off-white, some true white depending on the light, quite iridescent, smooth, sleek and shiny. None are towards gray, yellow or brown. There's a little natural variance in thickness and color - some have rainbows or stripes of light as they glow. Shape and holes are quite consistent. Not thin and not fat; just right. Quite lovely and clearly not plastic, they're glowing, nearly white shell. Last photo shows the backs; we call that look Butterscotch Tiger, and many of you use that as the front. 9/16", which is in between 1/2" and 5/8".  BULK DEAL, 500 BUTTONS FOR $24.00

These are the same size as LP-67, but these are more iridescent and most have Butterscotch Tiger on the other side.