Electric Acoustic Guitar Finger Expansion Sleeves Musical Instrument Accessories Finger Force Ukulele Piano Span PracticeFeatures:1. High strength, flexibility, smooth surface, easy to clean and solid.2. The spreader is used without a piano, so it is easy to carry.3. Improve finger span and flexibility, improve finger function, and improve game performance. Specifications:Color: BlueMaterial: ABS Resin Size:(L)Total Length: 145mm/5.71"Spacing: 22/23/19mm/0.86/0.91/0.74''Middle Finger & Ring Finger Hole Inner Diameter: 21mm/0.82"Index Finger & Little Finger Hole Diameter: 19.5/17.5mm/0.76/0.68''(M):Total Length: 139mm/5.47"Hole Spacing: 20/21/18mm/0.78/0.82/0.71''Middle Finger & Ring Finger Hole Inner Diameter: 20.5mm/0.81"Index Finger & Small Finger Hole Inner Diameter: 19/17mm/0.74/0.66''Net Weight: About 10gNotes:Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item. Thank you for your understanding 1 x Finger Expansion Sleeve