Please note that two types of ear tips are included with AKG N5005. The black ones are normal silicone tips, and they are fine for many users. The Milky-white ones are from the company SpinFit. They have a special middle section that permits the tip to swivel in all directions, making them able to adapt to various insertion angles. Please try both. For some, one is better, for some, the other one is better. You make the decision. In normal use, the tip that makes the best seal with your ear canal is the best choice, since bass reproduction is very dependent on this seal. However, some users may find that they prefer a slightly less tight seal.