Tie Guanyin, a variety of oolong tea: Tea bar curly, fat circle knot, heavy even, colour and lustre arenaceous green, the overall shape like dragonfly head, leptospirosis, frogs legs.

They are soft and smooth-skinned, with a circular or nearly circular Body disk formed by the head and pectoral fins. They are harmless unless touched or stepped on.

The kinematically admissible velocity field for the indentation of semi infinite medium by a round flat punch has been established.