Alloy 13 is a blend of Atom’s Boom and Juke urethane on an oversized aluminum core with a rounded lip.
The aluminum core not only  increases the overall roll (speed) but adds unbeatable durability. With the increased speed the rounded lip makes for easier cornering while still maintaining exceptional grip.
SOLD IN 4PKS
Features
43mm light weight aluminum core
9mm tire with 5mm rounded lip
99 grams per wheel 
Size: 62mm x 40mm
Hardness: 91a-92a
Surfaces: Slick Surfaces, Indoor, Smooth Concrete and Sport Court