Things I liked:So great to be able to fire my vintage Healthways Plainsman 175 again! Took 50 years off my life and made me feel like a kid again! These cartridges work perfectly. Thanks to Pyramyd Air for stocking these hard-to-find, essential items. Things I would have changed:My own age! What others should know:Shipping was fast and the packing showed evidence of extra care. Great experience, start to fast finish!