Loaded Dice

I need cow-shaped dice for a game that I’m developing. They would need to be loaded/weighted so that a variety of positions could be assumed when thrown. Dimensions should be approximately 2.5 cm (L) x 1.5 cm x 1.5 cm. The attached file is how I imagine the image to look. I would need a few prototypes to test before I could commit to a larger amount. I would need to see how they look, feel and perform. I am somewhat flexible on the overall look as long as they can be thrown properly.