Pentel Ain Mechanical Pencil Refill Stein HB Limited

[Features] 3-piece pack of guide pipe mechanism equipped with the popular Einstein core. You can replenish directly without getting your hands dirty.
[Core diameter] 0.5mm [Quantity] 40 pieces
[Stein core structure] Realizes a structure where the core is supported inside by the frame inside the core and is hard to break.
[Specifications] Blue, white, and red tricolor colors
[Size] Width 22mm x Depth 6mm x Length 79mm