★ Colorful Drop-in Toy Made by a Nursery School Teacher (Drop-in Pieces Only) - Set of 18 Pet Bottle Caps (Disinfected) Four pet bottle caps are stacked together, and beads are inside, making a rattling sound. They can also be used as building blocks. ☆ Stacked four high for easy handling by 0-year-olds ☆ ★ Please play with a guardian present to prevent accidental ingestion. ★ The tape may peel off due to deterioration. Please understand that this is handmade before purchasing. We also have many other educational toys for sale.