For many users, there is no need for a full-length foam roller as a half-length roller is long enough for many uses particularly for muscle ITB release on the legs that have become so popular with runners and other athletes. Rollers are used to enhance balance, body awareness, muscle re-education and muscular flexibility and provide dynamic strengthening. Features 18" Blue Half Round PE Foam Roller. Rollers are used to enhance balance, body awareness, muscle re-education. Muscular flexibility and provide dynamic strengthening. PE Foam. Colour: Blue Size: 45cm (18") x 15cm (6").