This Zareba Z-Snap-on Wood-Post Insulator Poly Tape Insulator Comes In A Pack Of 25 And Is Brand New. It Is Made Of Durable Plastic And Designed To Fit On Wood Posts. The Insulator Is Perfect For Use In Fencing In Your Livestock. Manufactured In The United States. Includes 25 Nails. They Accept Poly Wire, Up To 2 Inch Poly Tape and Steel Or Aluminum Wire.