Sounds like you've answered your own question! Lol
Not quite sure how they work though data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7 there are loads of extra fins in the box, but most are identical. The others are like blades, but I can't see how they would help? I've not seen anything like these before
Edit for stupid auto correct mistakes!
They are different sizes, colours, design of the same thing, because peoples are are different sizes.
I'll try and find some pictures of how the blades work and then try them out
/proxy.php?image=http://ecx.images-amazon.com/images/I/41GeTxxfZhL.jpg&hash=e55f456ec1db8aa932c9b9be1a7922ae
/proxy.php?image=https://images-na.ssl-images-amazon.com/images/I/41UYHQTl7OL._SL256_.jpg&hash=cda0d78f1a6856463fea0bbe432a55c9
/proxy.php?image=http://ecx.images-amazon.com/images/I/41BUUhB9H5L.jpg&hash=857e3e5886c8b688f42718f569557147
Quick search on Google images for Soundpeats...
I have a set of these > Pioneer SE-E721-K Fully Enclosed Sports Earphones: Amazon.co.uk: Electronics
https://www.avforums.com/attachments/71a1ns97bil-_sl1500_-jpg.597571/
They stay put alright, they clamp on the outside of your ear and there fine with rain and sweat.
Shure, really really good and comfortable, I have even slept with them on quite a few times.
SE425 Sound Isolating™ Earphones | Shure Americas
The extras are just different sizes of blades/buds to try if they dont sit snug in your lug data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7
mine were fine with the default but i always keep the extras safe just incase i loose them in a pocket/pouch when traveling to gym etc...
I have these, been using them for a couple of weeks now.Great sound quality, especially for the price, was quite suprised by them.