i know some brands with this straw.
but the ball's material is used by steel or matal.
if long time for use, afriad of some particals will drink by baby. so danger! i know bebe dream they have a produce it's ball has rubber in surface. so better for u.
wish can help u.
i found out what is 奶樽飲管 2 weeks ago at BeBe Dream the ball is rubber + plastic, it cost around $69......much expensive than the steel, but it is much safe for baby, it is Made in Japan, the steel straw is only cost $24 - $30, much cheaper, it is Made in China, the steel materials may comes off due to always wash.... :mrgreen: