Perfectly compatible: Unlike most straw caps on the market - this straw cover is specifically designed for stanley cup straw.
Meitesti Straw Cover Cap for Stanley Cup,Silicone Straw Topper Compatible with 30&40 oz Tumbler with Handle,10mm 0.4in Dust-proof Reusable Straw Tips Lids
4Pcs Straw Topper for Stanley Cup, Silicone Straw
NLORNLAW 4Pc Straw Covers Compatible with Stanley 40
Straw Cover Cap for Stanley Cup,Silicone Straw Topper Compatible