Description Friendship Single use Twisted Pair Stainless Steel Subdermal Needle ElectrodeFriendship Single Use Twisted Pair Stainless Steel FeaturesStainless steelNeedle Length: 7mm, 13mm, 19mm, Diameter: 0.4mm12 pairs individually packed per box12 colorsSingle patient use onlyFor more information please contact your Neurosource sales representative.