Unique model shows exaggerated perspective of a mollusk gill structure as well as cut-away section of the shell foot and mantle to reveal internal organs, Two separate inset diagrams also show the circulatory and nervous system, Activity set includes a 24""W x 18""H raised relief model detailed activity notebook with glossary key blackline master and color transparency, American Educational Products have a lead ship time of 21 days, SKU: AMED604