The product is a set of genuine OEM Toyota 3K pistons, with the manufacturer part number ART 13101-24010. These pistons are made by the brand Art and originate from Japan. Despite being labeled as "NOS" (new old stock), the pistons are missing their pins. The set includes one piston with a 0.25mm oversize. These high-quality pistons are designed for car and truck engines, specifically for Toyota vehicles. Perfect for those looking to upgrade or replace their current engine parts with authentic Toyota components.