After using the plastic washable straws from the department store, I realised a couple ot things. One, they sometimes don't fit the tops of my cups... too fat. Two, no brush to wash them with was included and so milk was extremely hard to get out of them. Three, that kids love to chew on the ends making me throw them out! When I ordered these...I got exactly what I thought I was getting... They fit my Rtic 30 oz, my Tervis, and my Ozarks... they are thin enough for the tops with the smaller holes. I like the colors too. All my grands can have one to use and they know which glass or cup is theirs. I just threw them into the dishwasher, silverware tray and let them dry. As an after thought... after struggling to get the rubber ends on two of them, I came up with this; use a thin coat of coconut oil at the tip of the straw to help ease the rubber ends it on. It worked great. I have four of my grands here today and they're enjoying their gatorades and waters right now. Love them very much! So glad I bought them too.