Size of foam slabs run 18" X 24” Requires only Glue and Water Base Paints For School Projects and/or Fun Educational Purposes! For enhanced detail and creativity, separate accessories also available for purchase All 21 California Mission Model Kits available for purchase *Finished Mission image shown as example only. Assembly required. Decorative details and accessories sold separately. Completed results may vary. The Basic California Mission Kit prepares for your child a basic structural foundation for this classic and timeless educational project! Kit includes Expanded Polystyrene Foam (Styrofoam) cut out pieces that can be pushed out from foam slabs and then easily assembled.