Dear Sir/Madam, Type:BMX Wheel Size:26 Frame Material:Aluminum Alloy Fork Material:Aluminum Alloy Rim Material:Aluminum Alloy Net Weight:13kg Gross Weight:10-18.5kg Item name:public bike sharing Material:aluminum alloy Battery:Polymer 8000mAh mode:bluetooth, GPRS, GPS App system:customized IOS&Android APP Usage:for safety,High Security Waterproof Level:IP67 Feature 1:Gps tracking Feature 2:Anti-theft. Alarm sensor OEM &ODM:Available Show More