NIMBUSNimbus® Microfine® Toothbrush - Regular Colors Vary by Nimbus Microfine

If I order package of 10, are all 10 toothbrushes in one package or are they with two packages of 5?? Compare if I order two packages of 5.

What type is recommended for 12 year old to use?

Where are nimbus toothbrushes manufactured?

In inches, how long is the bristle section of the brush ?