Features: Exquisite craftsmanship, complete parts, simple and convenient. Perfect for daily repair of wind instruments. High-quality materials ensure long-term use, helping to improve key accuracy and playing fluency. Suitable for B-flat trumpet, cornet, and B-flat palm replacement and repair. Trumpet finger button thread diameter is 4mm (M4); please check the size before purchasing. Helps quickly repair trumpets and provides more accurate buttons. Specifications: Material: Copper, Metal, Plastic Color: Multicolor Brand: BQLZR Size: Trumpet Finger Button: 16 x 10mm / 0.65 x 0.39 inch (Dia x T) Trumpet Finger Button Thread Diameter: 4mm (M4) Small Trumpet Drain Valve Key: 26.7 x 9.9 x 9.4mm / 1.05 x 0.38 x 0.39 inch (L x W x H) Large Trumpet Drain Valve Key: 47.8 x 10 x 8.4mm / 1.88 x 0.39 x 0.39 inch (L x W x H) Trumpet Cork Pad: 3 x 8.9mm / 0.11 x 0.35 inch (H x Dia) Trumpet Drain Valve Spring: 16.8 x 8.4 x 15.5mm / 0.66 x 0.33 x 0.61 inch (L x W x H) Trumpet Valve Spring: 46 x 8.8mm / 1.8 x 0.35 inch (L x Dia) Trumpet Valve Guide: 18 x 11 x 4.5mm / 0.7 x 0.4 x 0.17 inch (L x W x Inner Dia) Trumpet Valve Slide: 80 x 25mm / 3.14 x 0.98 inch (L x H) Trumpet Valve Slide Screw: 8 x 9.9mm / 0.31 x 0.39 inch (L x Dia) Tuning Screw: 24 x 7.9mm / 0.94 x 0.31 inch (L x Dia) Screw: 13mm / 0.51 inch (L) Weight: 58g Package Includes: 3 x Trumpet Finger Button 1 x Small Trumpet Drain Valve Key 1 x Large Trumpet Drain Valve Key 2 x Trumpet Spit Valve Cork Pad 2 x Trumpet Valve Spring 3 x Trumpet Drain Valve Spring 3 x Trumpet Valve Guide 1 x Trumpet Valve Slide 1 x Trumpet Valve Slide Screw 1 x Tuning Screw 2 x Screw