10 PACK - Use 3M Scotchlok 316IR Electrical IDCs to electrically connect two or three wire ends, insulate the connection and provide a moisture resistant seal. Recommended for use with low energy underground circuit wires, sprinkler systems, landscape lighting or other moisture resistance wires for applications of less than 30 volts. Sealant is a mineral oil based grease. Has an AWG range 22 16 Use splices to join your dog fence wire of same size together or for joining or repairing broken wire they are supposed to be used with either 18 or 20 gauge wire. They are different than the ones that come in the dog fence kits but work the same or better. Also use to join or add additional rolls of wire together,increasing your perimeter length or join the regular wire to the Fast Track Twisted wire. Because Amazon Policy's state all packages need to have tracking, your order will be sent USPS Priority Mail with Delivery Confirmation. That is why the cost of shipping is higher than first class mail.