Adjustable Finger Expander Guitar Training Span Trainer Finger Lute Size Feature: Finger Stretching - With its four-hole design, it expands the reach of your fingers, improve your performances. Freely Adjustable - The finger rings can be adjusted for the best configuration for your hands, and lock it with sturdy screws to start your training. Widely Usable - Suitable for training and expanding your fingers for playing multiple instruments such as guitar, bass, ukulele, saxophone, piano, etc. Different Sizes - Its available in three sizes measured to fit different types of hands and fingers, including children. Ensured Quality - Thoughtful design guarantees a comfortable experience and satisfying finger training, with durable materials that give it a long, reliable service life. Easy to Carry - Its small size and light weight make it easy to store and carry, allowing you to practice with it anywhere. Specifications: Color: White Materials: ABS Plastic Standard Plus Size Index Finger: 2.3 cm (diameter), 7.22 cm (circumference) Middle Finger: 2.3 cm (diameter), 7.22 cm (circumference) Ring Finger: 2.3 cm (diameter), 7.22 cm (circumference) Pinky Finger: 2.3 cm (diameter), 7.22 cm (circumference) Standard Size Index Finger: 2.1 cm (diameter), 6.59 cm (circumference) Middle Finger: 2.1 cm (diameter), 6.59 cm (circumference) Ring Finger: 2.1 cm (diameter), 6.59 cm (circumference) Pinky Finger: 2.1 cm (diameter), 6.59 cm (circumference) Kid Size Index Finger: 1.9 cm (diameter), 5.96 cm (circumference) Middle Finger: 1.9 cm (diameter), 5.96 cm (circumference) Ring Finger: 1.9 cm (diameter), 5.96 cm (circumference) Pinky Finger: 1.9 cm (diameter), 5.96 cm (circumference) Product Includes: 1 x Adjustable Finger Expander 1 x Screwdriver