Do you have any details, Andy? I know Marmit is a big character-item maker in Japan but X-Bomber would seem to be something of a niche even for them - I'd assume they were part of a Go Nagai-themed character series...?
"The power of bakers, the power of artists; even the power of witches! It must be a power given by God... sometimes we suffer for it."- Ursula, Kikis Delivery Service.