These high quality interlocking mats are made in North America and are black with a grey fleck. The tiles interlock together so well that you can't see the interlock when you are standing over them. It appears as a one piece floor. These tiles are low VOC and meet the California standards for VOC - the most strict in North America. Each mat is 2' x 2' x 3/8" thick and weighs 8 lb. These are the same quality, density, thickness that you would find in major fitness facilities such as GoodLife Fitness. This is ideal flooring for commercial use as well as home gyms. The tiles do not need to be adhered to the ground so they can be easily moved or replaced if damaged. Pricing ranges based on quantity purchased.