Hey Jason, I LOVE my t:slim! The supplies consist of everything you need to work with the pump (not the pump itself) I tried new insets that go in at a 45 degree angle because I'm very thin. Ended up not liking those as much as I thought I would so I switched back to different sets. When I switched back they sent me a whole shipment of ALL the supplies. So I suppose I could keep the cartridges but I figured I would try to help someone out if I could. This stuff is expensive and I have pretty rocking insurance.