SafeRacks 48" Wall Shelves, 2 pk. White Brand_Double "Q" The mind building lessons and activities The mind building lessons and activities in this 176 page book teach topics and skills drawn from state and national science standards to prepare students for more advanced science courses and new assessments that measure reasoning Increased levels of protein The two 48" shelves are easily installed side by side to form a continuous shelf or separately as needed This 24" x 48" two pack shelving system provides a total of 500 pounds of capacity and comes with four sport utility hooks to transform your shelves into a fully functional sports storage platform