Recently, electronic devices have been focused on the development of functionalities pursuing flexibility and stretchability. The inkjet printing technology has been an attractive tools to fabricate flexible electronics devices. The flexible inks based on polymer liquid containing conductive filler for inkjet printing are appearing in recent literatures. The performance of the flexible electrode is found to be sensitive to the sintering temperature, the pattern design, the adhesive-substrates interaction, and process conditions employed. In this study, a conductive carbon black (Ketjen black) is mixed with liquid rubber by varying the content in the range of 5~25 phr to produce a conductive and adhesive rubber ink. Initially the influence of tensile deformation on the electrical resistance of the fabricated ink was investigated. An electron microscope (FE-SEM) was used to observe the dispersion of the Ketjen black within the rubber matrix. Also, the adhesion strength of the rubber ink was measured. The results indicated that the electrical resistance reduced gradually by increasing the content of the Ketjen black. However, the adhesive strength of rubber ink was significantly not affected by the filler content. The electrical resistance was found to decrease with tensile deformation owing to the alignment of conductive filler networks.