Introducing the Estes Clear Payload Section Assortment for Model Rockets 9pk – the perfect way to add a unique touch to your rocket designs! Available for the first time ever, this set of nine payload sections includes three clear payload sections in three different sizes – BT20 ...Introducing the Estes Clear Payload Section Assortment for Model Rockets 9pk – the perfect way to add a unique touch to your rocket designs! Available for the first time ever, this set of nine payload sections includes three clear payload sections in three different sizes – BT20, BT50, and BT60 – so you can create truly unique and professional-looking rocket models. Perfect for novice and experienced rocket builders alike, this payload section assortment is an essential part of your rocket building supplies. Get yours today and add a unique touch to your rocket models!