The large size is the shock-absorbing ball model, not the cheap spring model The model with lights has a dedicated tail light connector; if you don't need the tail light, please note it in advance Single size approx 23cm*17cm*10 cm Manual measurement has error, about 640 grams Outer box size 87cm*50cm*30cm 30 pieces per box Mountain Bike Sports Model: Single size approximately 28cm*15cm*8cm, weight approximately 309G Outer box size 70*50*30, 40 pieces per box 30*72*47 50 pieces per box For large quantities, please contact customer service