Manes are affixed to the neck with glue.  There are several glue choices available but clients seem to prefer "future glue" or "Super Glue".   Manes can be removed with Clippers, Acetone or brand specific glue remover.

To order a mane, submit photo of the horse if possible and measure for the length you want from the bridle path to the withers.
Cost of mane is $10.00 per inch.
Can be made in individual sections or on a stip of elastic.