Be aware that Linsoul, the company that makes the Blon IEM here, has scant knowledge of the items they sell.
I bought a set of IEM's from them through Drop, and emailed Linsoul asking for the correct size of tips. The tips they include are of the cheap rubber type and I wanted better foam tips.
Unfortunately, their customer support gave me the wrong size and I purchased Dekoni foam tips that I understandably can't return.
Linsoul initially said they would refund 70% of the cost of the tips. I sent them the receipt and they responded by saying that since I didn't buy the tips from Linsoul, all they would do would be to issue a $5 Linsoul credit.
Everybody has bad days and everyone makes mistakes, but this is some bush league customer service. Sadly, I learned that you're on your own even when Linsoul screws up.