At 3.75" tall (9.5 cm), this platform is a good height to give you a boost up or down. No assembly is required. It is fully assembled right out of the box. The four legs and additional pegs under the step help distribute your weight safely. The newly-designed softer platform acts as a fatigue-preventing mat, too. It has a slip-resistant, textured massaging surface. Use this as you wash dishes by a sink or stand next to an ironing board. The platform measures 15.75" long (40 cm), allowing most people to turn around safely without stepping off comfortably. It’s ideal for single-person use, regardless of size. This step is good for children, too. Children can use it to boost themselves in the bathroom and access the sink or tub. For safety reasons, never stack two on top of each other. Disabled people of any age can use this step to help keep their feet secure, thanks to the textured bumps atop the step. The pliable feel of the step top can also help give them stability and comfort if they're standing on it for a prolonged period. Flat shoes or no shoes are best for this step. Shoes with heels or spikes might interfere with the texture of the step, making it unsafe. When not in use, this low-profile step can be tucked under a bed or couch or stored easily in a closet without taking up too much space. The black color is sleek and not visually intrusive. To clean, simply wipe with a damp cloth and mild soap.Details:Black15.75" x 19.5" x 3.75"No assembly requiredClean with mild soap and damp clothPlasticFor indoor and outdoor use