What is the hole in my 2-ply drumhead?

This hole is normal. Double ply heads (such as the G2) have a single air trap hole on the lower ply. This allows air to escape and allows the two plies to work better together. If you have 2-ply heads that do not show the hole about 1 inch from the rim, then the hole is beneath the collar (which was the old way of doing it).

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