Flanger FA-11 Pro Piano Exerciser Finger Trainer Piano AccessoryMore professional and pertinent than the general ones. It's an assistant instrument to make you a real pianist.Description:Brand: FlangerModel: FA- 11Name: Pro Piano ExerciserColor: Blue、Pink Material: PU+Sponge Szie: 145*40*40mm weight: 80g  Feature: Special designed span between two fingers is as wide as clamping a pencil and a perfect tool to train such a skill.   The exclusive function of single finger practice is needed for beginner pianists.  The tension of this product is scientifically close to piano keys   Correct the wrong hand postures and avoid finger slump.  Package included:1 x Flanger FA-11 Pro Piano Exerciser1 x Manual