Bubble tea straws are great for stacking tiers. I often make two-tiered cakes and these are perfect for supporting the top tier from beneath. I also use them often when making double barrel cakes. (For larger tiered cakes I would recommend either thicker plastic hollow dowels or a support system.)
As seen in
1/2” (12 mm) wide, 8 1/2 inches long FDA approved, recyclable material. Disposable. 100 pcs. Great for use when stacking two tiered cakes.