well i dont know what it is about 16vs in particular, but they're usually really rusty for a start. Plus not all cleaning places can actually do k-jet ones, often it was gonna cost me extra!
If you want k-jet ones the cheapest ones you'll get are them, brass ones from ebay, not found em for any less anywhere. Shame hes put the price up so much, I got a full set o them brass ones for £50 delivered a while ago
