Crazy Crawler CYC059 - LaserFoam 1.9 R109x45 Heavy Duty XOR (2)Crazy Crawler CYC059 LaserFoam 1. 9 R109x45 Heavy Duty XOR (2 pieces) Tire inserts 1. 9 for 1 10 scaler and crawler. Heavy Duty version for vehicles up to a total weight of approx. 3. 5 5 kg. Special made for Pitbull Rock Beast XOR (#PB9014AK not sold by us). The Crazy Crawler LaserFoams 1. 9 R109x45 XOR Heavy Duty are special cut tire inserts made of foam. They give the 1. 9 tires significantly more lateral stability and still remain nice and soft on