This playful Green Line keychain shines with a rainbow holographic finish that shifts beautifully in the light. Whether you’re a Boston local, a commuter who knows the quirks of the T, or just looking for a unique souvenir, this keychain is a fun nod to the city’s most iconic subway line. ✨ Details: - Size: 3.35" × 4.92" (85 × 125 mm) — overall size including backing card - Material: Rainbow holographic acrylic with a smooth, crystal-clear finish