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Today I'll not only explain the differences between all possible double devices, but also tell you when you need the D12, when a D8.5 is enough and when an aluminum device is worth it. I'll also get to the bottom of the question of what is better: a convex or concave base? Have fun watching, Sebastian The next courses: https://www.sebastianvonkoss.de/termine Contact: http://www.sebastianvonkoss.de email: [email protected] Facebook: https://www.facebook.com/profile.php?... Instagram: / sebastian.von.koss Detailed videos on many interesting topics: http://gue.tv More information about the GUE course program and our instructors: http://www.gue.com Introduction: 0:00 Important information about the double device: 1:12 Convex vs. concave bottom 3:50 D8.5 as an alternative to the D12: 7:00 Aluminum bottles: 11:09 Conclusion: 14:01