Family fun:perfect for kids ring toss game,field days game,speed and agility training ,get together party,children's party,bridal shower game,game boothAgility rings: great for improve children's ability to coordinate hand-eye,patience,discernment and focusPlastic rings: harmless,can be used oudoor or indoor,pool,in the waterSize:Inner diameter:3.35inches/8.5cm Outer diameter:3.74inches/9.5cm Thickness:0.2inch/0.5cmWhat you get:15 x training rings(3 pink,3 pink, 3 green, 3 yellow, 3 red and 3 orange )