The first consumer product made of plastic was the comb. In the early 20th century, celluloid, a type of plastic derived from cellulose, was developed and used to create combs. Celluloid combs gained popularity due to their durability, affordability, and the ability to be molded into various shapes and designs. They quickly replaced combs made of materials such as bone, tortoiseshell, and ivory, which were expensive and less readily available. The introduction of celluloid combs marked a significant milestone in the use of plastics in consumer products.