This spacer allows for a width of up to 14.5 centimeters (5.7 inches). The original valve index seal allows up to 13 centimeters (5.1 inches). It has a small notch inside that gives it more space. I don't know why they haven't posted these sizes, but here they are. If you don't have glasses, just wear the original glasses. It is not worth. The leakage valve is ok. Velcro is ok. The face pad will be slightly warmer than the OEM pad and may stick to your face depending on your skin. I recommend purchasing an Index fan accessory for heat dissipation when you get this spacer. On the other hand, it is easy to clean. The only reason it gets three stars is because it seems to be the only one that allows me to wear glasses. If there is ever a competitor I will change this rating to one star.
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