Shell buttons are lightweight and thin 

The Large Dark and Large Light Moon buttons measure 18mm / 6/8". The small Moon + Star and Stars buttons measure 15mm / 4/8". 

The Large Lace buttons measure 22mm / 7/8" and the Small Lace buttons measure 15mm / 4/8".

The Large Light Blue buttons measure 22mm / 7/8".

The Flower Shape w/pink, blue and green decoration buttons measure 18mm / 2/3"

The Purple Laser Leaf buttons measure 18mm / 2/3"