These do not fit like the originals. They will fall out and burn you if you aren’t careful. Disappointed.Broke my original ones.These work.(Arizer original version )Super easy to clean. Throw them in 91% Alcohol and let them sit a few hours and then rinse, presto.Ordered these after breaking the OEM drying tube. The mouthpiece is a nice touch and greatly improves the smoke.One of the three stems arrived used. The other two look ok but I'm grossed out by having one used and still dirty so I'm not using any of them. Total waste of money. Save yourself time and trouble and buy from arizer directly.I bought these for my Solo 1. They work well.I don’t really like itThey fit well.