TSK SteriJect Needles 33G x 4mm Premium hypodermic needles manufactured in Japan. Produced with the specialist in mind. Made of surgical stainless steel with polypropylene hub they are FDA registered, CE Mark, and ISO 9001 certified. Founded in 1974, TSK is a Japanese company. Its name is pronounced Tasuku. This means “to help” in Japanese. TSK was founded with the aim of producing high quality medical supplies for the purpose of increasing patient well-being. TSK needles can be up to 33% thinner than other needles. This difference in thickness makes all the difference in terms of bleeding after penetration of the needle into the patient’s skin.