The LEGO DUPLO set 5657, Jessie's Round-Up, is a building toy designed for young children aged 2-5. With a total of 18 pieces, including the character Jessie, this set allows children to engage in imaginative play while creating their own cowboys and cowgirls. The set includes a round-up scene with a big top and various accessories to enhance playtime. Released in 2010 as part of the DUPLO theme, this LEGO set offers a fun and educational building experience for little ones.