6PCS Silicone Straw Covers Cap Compatible with Stanley Cup 30-40 oz Tumbler with Handle 10mm Straw Toppers，Dust-Proof Reusable Straw Cover for Stanley Cup Accessories (Black)

I really like these straw covers. They work perfectly with the straws on my 30 and 40 oz Stanley tumblers annnd the straws on my Simple Modern 40 oz Trek tumblers. I love the variety of colors that come in the set. They are a soft silicone, easy to use, easy to clean, fit snugly and I haven't had any issue with the straw leaking. I bought the multicolor pack and months later came back and bought the set with black and white. Love. Recommend x2.

They work fine

Fits perfectly

Percent topper for my 40 ounce Stanley straw.

These are fine and do the job. I took one star off only because on some straws (I only use glass) they can be a little loose, but not a bit problem so far.

This model fits perfect on the straw nipple for the 40oz hydroflask tumbler

Works great.

I had no idea these were a thing until recently. Now I can keep dust from falling and flying into my tumbler. I bought black to go with any color cup, and their appearance is just minimal. No plastic content, since they're silicone. They're durable, so they also keep the cup a little leak proof, too. Just wash it with your straw. It doesn't get in the way, making it comfortable to keep your straw covered.

Útiles. Seguros. Fácil de limpiar. Hasta el momento bien en general