One of the problems with 6mm filtered pipes is that they tend to be on the small side and the larger ones are a lot more expensive than the smaller models. Now you have another choice - Crown Jewels Pipes. These Italian-made pipes are around average in size and feature a glossy-black sandblasted finish along with jet-black stems designed to take a 6mm filter. Even better, these pipes are around the same price as many of the smaller filtered pipes.