This is the set of two 1.9 Rock Beast XL Alien Kompound tires with foam. The Rock Beast XL Scale 1.9's are miniaturized versions of the Champion Pit Bull Rocker LT 1:1 tires. Our multi-varied tread design increases forward/reverse and lateral traction with serious biting across the footprint. These Rock Beasts have many features designed to increase speed and control while enhancing stability and contact patch. Excellent lateral bite--incredible stickiness and exceptional traction. Alien Kompound - Super Sticky - Stickier than Alien Snot! - great wet or dry. These will hold on in off-camber situations.