This item is an incomplete science kit by Home Science Tools.
It includes five black trays, four clear plastic trays, and a heart dissection instruction manual.
The clear trays measure 7"x 7" square with a depth of 1/4". The black trays measure 10.75"x 9.25" with a depth of 1/8".
This kit is great for any girl or boy interested in science.
These items come in well-used condition with paint marks on the backsides of the black trays, scratches, and scuffs around the edges, and scratches on the clear plastic tray from previous use.