Pennies came with oil stains that could not be washed off. I contacted customer service and their solution was to polish them. These are 1943 steel pennies colored copper...a fake light orangish copper. Doesn't pass as real in my opinion.

Ordered a set of these to go with 'Little Hand'. They work just fine, but when the package came, the coins were brand new pennies in a small plastic bag and they had some sticky substance on them, dripped in spots (not a coating) like they had something sticky spilled on them. I tried cleaning them, but it had stained them. They looked bad, as some parts were brand new and shiny, and some parts of the same coin were old and tarnished.
I notified Penguin, and they sent out a new pack ASAP. The new pack had the same stuff, but less of it and they weren't as badly stained.
So, be aware they may come stained.

Used them for glass bottle penetration and they worked great.

I have purchased steel core coins in the past that have split apart.Not the case here. Very well constructed.

Real copper-coated steel pennies from 1943! Work great with Raven(TM)!

Real copper-coated steel pennies from 1943! Work great with Raven(TM)!