Traditionally tape is used on the floor to indicate where the talent is supposed to stand . This works but does leave tape on the ground and can damage the surface such as trying to remove it from a roll of seamless paper, or leave unwanted glue residue behind. The camera t marker features 1000 denier nylon construction for strength and durability, filled with18 oz of shot so it stays put, multiple colors available, a grommet for easy storage and transportation, 6" x 8".