These are 2.2" Proline Truck Soft Memory Foam Inserts for tires.
These fill the empty space in between a truck tire and the wheel.
FEATURES: Soft memory foam design
Ideal for rock crawling applications
INCLUDES: Two Foam Inserts
SPECS: Outer diameter: 120.65mm (4.75")
Inner diameter: 44.45mm (1.75")
Width: 60.325mm (2.375")