This is simple design for a splint is very useful. It is designed to be a finger splint but with simple readjusting with the size ratio it can be a wrist splint or an ankle splint. The filament that should be used is NinjaFlex, SemiFlex filament. It is flexible enough to bend somewhat but it is sturdy enough to keep the finger, wrist or ankle sturdy. The holes in the side are for a strap to secure it to the appendage.