These are Pro-Trax Rear Tires with Foam Inserts from Traxxas.

This is an Optional part for:

1/10 Monster Jam Trucks (3602)
1/10 Stampede 2wd XL-5 (3605)
1/10 Stampede 2wd (Mechanical Speed Control) (3606)
1/10 Stampede 2wd VXL (3607)
1/10 Rustler XL-5 (3705)
1/10 Rustler VXL (3707)
1/10 Nitro Stampede (4109)
1/10 Nitro Rustler (4407)
1/10 Nitro Sport (4510)
1/10 Jato 3.3 (5507)

Features:

• For the Rear
• Soft Rubber Compound
• Spiked Tread
• Foam Inserts

Includes:

Two (2) Tires
Two (2) Foam Inserts

Specifications:

Inside diameter: 2.2"
Outside diameter: 3.7"
Width: 2.2"

Verify that this item is appropriate for your vehicle.  Consult your manual or vehicle manufacturer. Verify vehicle fit-ment before purchase.