The Kumeyaay were adept at creating tools and other goods from their natural surroundings. They excelled in the production of fine coiled baskets made from agave, deer grass and sumac. The fiber of the yucca plant was woven into rope, and sandals were made for their feet. The Kumeyaay formed and fired ceramic clay pots using the natural materials found here on the coast and mountains. They knapped local quartz and obsidian into knives and projectile points. They chipped shells of mussels and abalone to make fishhooks and beautiful jewelry. Abalone shell (mother of pearl) was an especially valuable trade item.