I was going to type my own explination ast o what they are… But I think I’ll just cut and paste….
“Kotobuki’s easy-to-use egg mold works like magic on a just-cooked egg. Place the shelled hard-boiled egg into the mold bottom, slowly close the top and secure. Then place egg and mold into cold water for 10 minutes, and voila! Slowly open the mold to reveal an egg with a new look. Sold in sets of two different shapes, this set includes the Fish and the Car. Rabbit, Bear, Heart, and Star shapes are sold separately.“