Iron Treads ex #73 from Scarlet & Violet Black Star Promos is a reverse holo promo card that currently sells for about $1.46 ungraded, with graded copies ranging from $10.00 at grade 9 to $31.00 at grade 10. A grade 10 copy sells for around $31.00, about 21× the $1.46 raw price, so high-grade copies are worth grading.