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Running back is the NFL’s ultimate position of attrition. It’s a job with the lifespan of a Spinal Tap drummer. Usually, by Week 17, a running back with a heavy workload looks like a used sedan with 200,000 miles on it — rattling, leaking fluids, and praying it can make it to the driveway.

Preview the player prop betting lines, stats and more for Christian McCaffrey before his San Francisco 49ers play the Seattle Seahawks in a Week 18 NFL

San Francisco 49ers RB Christian McCaffrey bursts through the defense for a 41-yard run against the Chicago Bears.

San Francisco 49ers running back Christian McCaffrey has had a remarkable season, which included him moving into ninth in 49ers rushing yards.

No NFL offense has been hotter as of late than that of the San Francisco 49ers, and it's been due in large part to the play of quarterback Brock Purdy

Brock Purdy hit Jauan Jennings with the winning TD pass and the 49ers held on in a game that featured 936 total yards and 10 offensive TDs.

Brock Purdy, Christian McCaffrey and the rest of the Niners will rock nostalgic threads on Sunday Night Football this week.