Precious Plastic Product Stamp Tool (Stamp recycling symbols on your plastic creations!)

I've been making injection mould tools for Precious Plastic and micro factory setups for several years now, and one thing I keep finding is that most customers dont want to put a recycling symbol into their moulds, as they aren't 100% sure what type of plastic they will end up using in the long run.
I have a recycled plastic keychain that I bought, it's marked #5 PP however it's made from LDPE - which is a real shame because it might get melted down with some PP in the future, and create problems.
This stamp set comes with the 4 most common recycling plastic types (#1, #2, #4 and #5) and is available for purchase on the Precious Plastic Bazar - bazar.preciousplastic.com/mou...