This is a 1988 Topps All-Star Rookie card for Big Mac Mark McGwire.  McGwire is a 12-time All Star, 3-time Silver Slugger, and 5-time MLB home run leader, briefly holding the single-season home record at 70 before Barry Bonds broke it three years later.  This card has been professionally graded by PSA as an 8, indicating NEAR-MINT / MINT CONDITION.