If I use finely ground tea will they completely spill through the holes? Or are they small enough?

It depends on the tea. I made a cup with very fine leaves and it was an issue. What I did was gently dunk the ball into a cup of warm water, or under the tap, to wet the leaves first. Then, let it sit on a dry saucer for a few minutes while your water boils. This causes the leaves to expand inside the ball and become far less prone to slipping thru the holes. I did get a few bits here and there, but just a trace.

how much loose tea does it hold?

This holds a standard 1 (one) teaspoon of loose tea, using a measure. If you try to fill more, that might spill.

What is the overall length of the product? I'm looking for something that I could use inside a typical stainless steel coffee/tea travel mug

The overall length of the OXO Twisting Tea Ball is 7 inches. Hope this information helps.

What is the ball made of? Does it contain any aluminum?

I think the whole thing (besides the plastic handle) is stainless steel, based on its description from all the sites I looked at.

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Description

🍵 Twist, steep, sip — elevate your tea game effortlessly!

HASSLE FREE CLEANUP - Dishwasher safe and BPA-free for a safe, convenient, and eco-conscious tea ritual.
COMFORT MEETS CONTROL - Soft, non-slip grip offers comfortable stirring and precise steeping every time.
PURE PARTICLE FREE BREW - Extra small etched holes ensure a smooth cup, blocking even the tiniest tea bits.
UNIVERSAL MUG COMPATIBILITY - Long stainless steel neck fits most cups and mugs, resting securely without slipping.
EFFORTLESS LOOSE LEAF LOADING - Twisting handle lets you scoop and fill large amounts of tea without mess or fuss.

The OXO BREW Twisting Ball Tea Infuser features a unique twisting handle for easy filling and emptying, ultra-fine etched holes to prevent tea particles from escaping, and a long stainless steel neck that fits most mugs securely. Designed with a soft, non-slip grip, it works with all loose leaf teas and is dishwasher safe and BPA-free, making it a practical and stylish choice for tea enthusiasts.