These are Proline 2.2"x3.0" SC Closed Cell Foam Inserts.

FEATURES: Lightweight, durable and balanced
          Reusable, high density and waterproof
          Matches contour of SC tire profile
          For use with Pro-Line 2.2"/3.0" tires
          Can also be used with stock 2.2"/3.0" Slash, Slash 4x4, Slayer, Blitz
            and SC10 wheels (with use of grey inserts)

INCLUDES: Four blue foam inserts

REQUIRES: Installation into tires

SPECS:    Blue Inserts:
            Outer Diameter: 3.7" (93.98mm)
            Inner Diameter: 2.75" (69.85mm)
            Width: 1.55" (39.37mm)

                                                                    jml 2.3.11
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