4 Piece Bamboo Square Bowl Set 
1 - 11" across
Salad Serving piece and approximately 4.75" tall
3 -  6" across
Small Bowls and 3.25" tall
There are no cracks in the bamboo in any of the pieces.  
I can not remember if I ever used them so I will note them as being used.  They look new.  There is one rough edge on the side of the large bowl.  Does not effect the use but worth mentioning.  
They do not have a makers mark.
Bamboo is an environmentally friendly and naturally replenishing grass, and it’s one of the world’s most renewable resources. Bamboo is harder than maple wood and stronger than steel. A special heating process caramelizes the natural sugar in the
bamboo, producing its beautiful, permanent color (it is not a stain). Bamboo products should be hand-washed (not put in a dishwasher) with a mild soap and cool water, and then dried thoroughly. The occasional use of mineral oil will help maintain the
natural beauty