Size 12"to 20". With the best quality and the lowest price. Steel frame. frame fork and colors according to your order.
frame: Steel, stoving, varnish, thickness is 1.0mm
Axle" A/B axle, British System, BLK/UCP
Brake: F caliper brake ED thickness is 2.5mm/
Brake: R caliper/band brake/coaster brake/V brake
Tire/tube: Air tire of MTB type, E/V, 12"× 2.125 16"× 2.125 20"× 2.125
Handle bar/stem: U type handle, princess type stem, cp, thickness 1.2mm
Chain wheel &crank: 12"--24T*89, 16"--28"T*102, 20"--32"T*127, ED/CP

Pedal: Without ball, plastic with reflector, British System, cp, thickness 1.2mm
Rim: Alloy rim or steel rim, cp, 0.95mm
Freewheel: 12"--16T, 16"--16T, 20"--18T
Chain: 12"--60L, 16"--70, 20"--84T
Mudguard: Iron, 0.5mm /plastic
Chain cover: Full type/F type/P type. 0.4mm
Training wheel/leg: Colored/enhanced type, thickness is 2.5mm, ED.
Side stand: 8.5, ED (just for 20")
Quantity in one 40hq (ckd 4 sets/skd 85%)
12"---2400/1150 sets
16"---1900/800 sets
20"---1500/580 sets
MNQ: 40HQ
Other parts are like the picture or according to your demand.