Model, Calcite (1/2 unit cell) Crystal, is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3), The other polymorphs are the minerals aragonite and vaterite, includes 66 1 inch balls, Dimen
Birthing Stages Trainer, contents: 6 birth stage inserts, Safety plate with 4 screws (for the optional insert in birth simulator P90), Lubricant, Carry bag, The inserts look the same from the outside, using a number code on the back, the condition of the cervix on the inside