The wires do not need to be stripped as the IDC connection in the crimp does that for you. They are very simple to use, insert one wire in each hole and just squeeze down using pliers.
100 x 2 Way Jelly Gel Crimps BT Virgin 2 Wire Telephone Connector Cat5/6 Telecom
1000 x GENUINE DEXGREEN 8A 2 WIRE JELLY CRIMPS BT VIRGIN PHONE CONNECTOR JOINER
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1000 8A/1 UY2 2 Wire Telephone Jelly Crimps BT Virgin Telecom Connector Joiner