Glistening, iridescent natural off-white/pearly tan Mother of Pearl (MOP) shell button is 5/8" x 7/16", with two 1.75mm holes. Natural variance per the photos; some towards pale rainbow colors and some with pretty, from-the-sea inclusions. Backs are mottled brown. Pack of 12 buttons for $4.50

5/8" the long dimension, 1/2" the short dimension. 

Where you see "Only ___ Left", that's how many packs of 12 we have, not how many individual buttons.