These are Red TUBES 128mm Toe Links from Traxxas.

This is a Stock part for:

1/10 Revo 3.3 (5309)

This is an Optional part for:

1/10 Revo 3.3 (5308)
1/10 E-Revo EVX2 (5603)
1/10 E-Revo EVX2 (5605)
1/10 Summit (5607)
1/10 E-Revo Mamba (5608)
 
Features:

• Fits Front or Rear
• 30% lighter than stock steel toe links
• 4 times stiffer
• More than twoce the strength of aftermarket Titanium
• Unique hollow tube design using 7075-T6 aluminum
• Anodized Red in color
• Add a high-tech stealth look
• Front and Rear Rod Ends
• Includes Wrench

Lightweight Aluminum Turnbuckles 30% lighter than steel, more than double the strength of titanium! TUBES® add a high-tech stealth look to Revo and Maxx trucks. TUBES are 30% lighter than the stock steel toe links, plus they’re 4-times stiffer and more than double the strength of aftermarket titanium! These are the strongest toe links you can buy for your Maxx or Revo. The secret is in the unique patent-pending hollow tube design that maximizes stiffness and resistance to bending, while at the same time reducing weight. The beefy size tells everyone your truck means business. Traxxas TUBES are manufactured from high-grade 7075-T6 aluminum and anodized in both carbon black and red. To prevent marring the finish, a metric aluminum wrench is included for adjustment. The broad center nut makes it easy to line up the wrench for fast, trackside tuning. A handy machined groove on one end easily identifies the left hand threads.
 
Includes:

Two (2) Toe Links
Four (4) Front Rod Ends
Four (4) Rear Rod Ends
One (1) 7mm Wrench
 
Specifications:

Length: 5.04" (128mm)
Diameter: 0.45" (11.5mm)

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