When compared with 2016's original AirPods and refreshments, the teardown showed the new AirPods. The new buds weighing in at 0.19 oz (5.4 g) each.
Another new piece of hardware is a button cell battery which sits in the main body of the buds, as opposed to the long, thin battery which was located in the stem in previous models. The watch-style button cell battery is similar to the one found by iFixit in the Samsung Galaxy Buds, but unlike the Samsungs, the AirPods battery isn't replaceable. That's due to a soldered cable tethering the battery in place.
The one user-replaceable part of the Pros is the silicone tips, but the buds aren't compatible with typical aftermarket tips. You'll need to purchase tips from Apple if you want to replace them.
That means the AirPods Pro are essentially disposable, with no improvements in repairability over previous generations. That's disappointing but not surprising. Wired's Lauren Goode The apple that holds them together.
An update to Monday's report: Apple has confirmed that the new AirPods Pro are more than previous versions of the wireless earbuds. The pods are made with recyclable materials but due to you and build process (sequentially glue) it doesn't repair. Just replace.
– Lauren Goode (Lauren Goode) October 30, 2019
In conclusion, iFixit declared the AirPods Pro are "theoretically semi-serviceable" but the glue and lack of replacement parts makes repairing them a no-go.