The straw topper will fit standard 10 mm straws and the topper is made from PLA (plastic) and is also 3D printed. The straw housing is made from TPU (flexible plastic) so neither are silicone.
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While Stanley tumblers may appear in the photos of this listing, this product is not affiliated with Stanley in any way. The tumblers are merely showing the fitness to their tumbler and is an independent accessory designed to fit their tumbler.