Spill Proof Stopper Silicone, Compatible with Stanley Cup 1.0 40oz/ 30oz, 9Pcs Tumbler Accessories, Including 4 Straw Cover Cap, 2 Square Spill Stopper, 2 Round Leak Stopper & 1 Brush (White, 1.0)

They get the job done

2 of the straw caps are a smaller size and don’t fit the straw. The center cap that goes inside the Stanley doesn’t stay on so doesn’t prevent water from coming out.

Everything was perfect but what l really wanted was not fitting on my straw.

My leaking cup problems are over!!These work for all standard size Stanley cups size 40oz as well as knock offs. It’s all the same manufacturer and different brands added after.These parts fill the gaps to prevent leaks. They work really well!

It’s just as described however.. the hole for the straw topper is not big enough for a Stan straw.