THIS SHAP AND SIZE IF FINE BUT THE WORK QUALITY IS QS POOR AS IT CAN GET. THE 3 DIFFERENT SIAES, STACKABLE MAKES IT VERY CONVENIENT AND TAKES LITLESPACE. THE LETS AND FRAME ARE METAL, WOULD SUGGEST A RUST PROOF SPRAY ON THEM, WILL KEEP THEM CLEAN AND EARLIER TO DUST. USE THEM ALL THE TIME INSIDE AND DOESN'T SCRATCHMY WOOD FLOORS.