Buckle type: rear four rows of buckles

The center hole for potentiometers is approximately 6mm in diameter

18 yards / inner length 13cm

Electronic

you can massage at any time to relieve the pressure of work and life

Kids' Floor Piano Keyboard Mat – Interactive Step-on Musical Play Mat with Electronic Sound Effects Color:White Buckle type: rear four rowsDescription: Material: PlasticProduct Attributes: StandardPackage Size: 400 300 100mm Specifications: Color: Black and White Main Material: PEVA Dimensions: 71 29. 5 inches (Length Width) Power Supply: 4 AA Batteries (not included) Recommended Age: 3 years and above Features: Interactive step on piano keyboard mat for kids Encourages musical learning, movement, and coordination Soft and foldable design for easy storage and portability Suitable for