We just installed the gym tiles, very strong in odor. What is this made of and what are the hazards?

Our 3/8" Sport-Lock Rubber Tiles are not hazardous and are made from recycled rubber with a urethane binder to keep the tile together. To help to mitigate the odor of the flooring, we recommend mopping the flooring with a mild soap and water solution and then letting the flooring air dry. This may need to be done a few times to eliminate the smell.