Rugged construction - Combines a leak-proof, tough outer shell with solid foam - filled inner floatation that is practically indestructible! - Brilliant Choice of colors Ultra violet inhibited colors are compounded into the outer shell for longest life! - Wide Range of Application - Available in sizes from 3 x 5 up to 8 x 14 and may be used with ropes ranging in size from 3/8 up to 7/8 in diameter!