FRAME MATERIAL & LIGHTWEIGHT DESIGN – High-strength aluminum alloy frame, lightweight yet durable, with strong corrosion resistance, suitable for riding on various terrains. PRECISION GEARING & BRAKES – This mountain bike features 21-speed drivetrain with front/rear disc brakes ensures effortless climbing and reliable stopping power. SHOCK-ABSORBING FORK - High-response suspension fork absorbs bumps and vibrations for smoother rides on rough terrain. KNOBBY MTB TIRES – Wide knobby tread provides superior traction on mud/gravel, with puncture-resistant layer to prevent flats. ALWAYS RELIABLE – RoyalBaby bike complies with the CPSC and EN-71 standards, and is trusted by millions of families from over 80 countries. Customers will be provided with high level warranty and local 24 hours service when contacting RoyalBaby for any queries.