nope! looks like the yellow ones twist on also
http://www.streamsideflyfishing.com/l2lreconnect.html
http://solutions.3m.com/wps/portal/3M/en_US/Scientific_Anglers/Fly-Fishing/Products/L2LReconnect/Leaders/TroutPanfishTapered/
click on "l2l reconnect leaders" on the left side of this page, click the leaders on the left and then see the chart at the bottom of the page for color codes