Jai Alai baskets, also known as cestas, are hand-woven wicker baskets used in the sport of Jai Alai. The baskets are made from a combination of wood, reed, and leather and are used to catch and throw the ball during the game. The shape of the basket is designed to help players catch and throw the ball with greater accuracy and speed. The baskets are an essential part of the game and have been used since the sport's inception.