Floor Mats for Children's Rooms. 10 Pieces Non Toxic Interlocking Crawling Mats It's simple to clean and maintain. It's easy to store. Cutouts of the numbers 1 to 10 can be used to educate the kid. The split joints on these mats make interlocking a breeze. 30x30x1 cms (about). Best for youngsters aged 3 and up.