Frame : Pulse TIG welded steel Fork : BMX TIG welded Steel Handlebar : Dual adjust, Steel Pipe : RB patent stem, steel Cuvettes : Steel twin bearings 8pcs set Gear : One piece crank Monobloc : Set RB Patent Sealed Bearing Pedals : RB patent antislip ball bearing Tires : 2.4" RB knobby Pneumatic rubber Rims : Steel Sprockets : 16T Sleeves : RB patent, anti-slip, TPR Sa : RB patent, one piece saddle Accessories : Electronic doorbell, water bottle, jack, tools Training Wheels:  Not included, can be purchased separately