Hobbypower 1/10 Alloy & Carbon D3 4WD Drift Racing RC Model Car Frame Kit with Front One Way 1/10 4WD Drift Racing Car Frame Kit for D3,come with the front one way differential for free Black carbon fiber chassis The three belt for four wheel drive (4WD) Anti fetal drift ratio 2.14 it's a almost assembled finished version, you just need install battery and electronic accessories for run.