Hygenic brand Natural Rubber Tubing and solid cord is produced from dry natural rubber. Features the same properties as amber latex tubing with the only difference being that this tubing has a smooth black finish. Using this process allows us to produce a tubing product with undetectable levels of protein. (Based on ASTM D5712-99, less than 50 ¬µg/g extractable protein.) Tubing is offered in boxes only.