I have tied similar mouse patterns for years until I finally found a commercial tie that was similar to mine. I very much prefer the trailer hook as it results in more safe upper lip hookups, when tied with a rigid material like flexible wire. Most commercial Hankeys use this. I used to use stiff mono and shrink wrap. Anyhow the ones you sent were attached with flacid nylon, which allows the hook to dangle at any angle. Otherwise, a well tied fly.