You are buying 1 - bag of Dare Black Widow Electric fence Insulators. They are Dare Model BW-WP-25. They are made for Wooden Posts.They come in a bag of 25. These are black in color and come with nails. The bag weighs app. 1 pound.
The following information is from Dare.
High density black linear polyethylene with UV inhibitors. Operates well in any climate, in any part of the world. 45 degree slot easily accepts any fence wire and holds it in place. Nails included. Black only.
Shipping will be Free First Class Mail to USA locations. Thank you for looking.