These are great dishes for all your arachnids and reptile needs.  They are dishwasher safe, and very easy to clean.  Comes in 4 sizes.
Extra Small:  3.75" x 2.5" x .75"
Small:  4" x 3.5" x 1.5"
Medium:  6" x 5.5" x 2"
Large:  7.5" x 6" x 2.5"