Pigs Unlimited 24" Med Density Criss Cross Pig Double Dish MCDD24Medium density criss cross foam pigs are constructed of medium density foam and coated with polyurethane elastomer in a criss cross pattern. They are used for regular duty wiping, batching, and product removal applications. Options and other configurations include double dish, double nose, pulling rope or cable, transmitter or pinger cavity, jetting bypass ports, magnets, and customized diameters and lengths for special pigging applications.