1.Limb Clamp and Suction ECG Electrodes bulb 2.Perfit for 3.0mm Din plug3.Latex-free,Website:http://www.upnmed.org, Adult size replacement bulb for all 15mm, diameter electordes,Bulb volume is 5cc4.Compatibility:all Resting ECG Recommended for GE-Marqutte,Schiller, Bionet,Mortala,Burdick....  5. Package:  1box = 4 electrodesLimb Clamp  Color coding: IEC,red, yellow,black, green  1box= 6 pcs