We ordered two not that long ago and we love them The material is thick and sturdy enough. It helps with daily behavior reminders for our dog during walks.
My husband and I are both professional dog handlers in a kennel environment. The Radar K9 DDL became both of our favorites, instantly. Every feature is thoughtfully done, and it feels light in the hand and is easily pocketed. Wonderful leash and our go-to from now on.
For silent slip, measurement is the length of the collar from the inside ring to ring, or stitch to stitch. I have to exchange mine, but quality is still great. I bought a 21 inch silent slip. Picture attached.