Pack of 10 - Use 3M Scotchlok 316IR electrical IDCs to electrically connect two or three wire ends, isolate the connection, and provide a moisture-resistant seal. Recommended for use with underground power lines, sprinkler systems, landscape lighting or other moisture resistant wires for applications less than 30 volts. Sealant is a mineral oil based grease. Features an AWG range 22 16. Use splices to connect your dog fence wire of the same size together or to repair broken wires. They should be used with either 18 or 20 gauge wire. They differ from those that come in the dog fence kits but work equally or better. Also suitable for connecting or adding additional wire rolls to increase your perimeter length or connect the normal wire to the Fast Track Twisted wire. Because the Amazon policy all packages have tracking, your order will be sent USPS Priority Mail with delivery confirmation. Thats why shipping costs are higher than the first class mail.