This is a bearclaw manufacturing hoop. They ship FAST and through Fedex (I'm not sure if this is important to some people). These are removable spines. I'm not sure if they are made to legit go on the inside but I screwed some in to test it like that. I also bought the deluxe fire kit with it. The deluxe comes with duvetyne, oil lighter, two paint cans, and a can opener. My hoop is the Sunhoop 4 with four snap connections, removable spines, and six inch steel spines. It's 40" and when people say practice with your fire hoop, they are right. It's so odd to realize your hoop isn't the usual space but wider. Does that make sense?
Overall, I'm very happy with this hoop. The only issue I have is that when I snapped it, it unsnaps in motion. I have snap hoops which means I'm familiar with the collapsible snap hoop wiggle. It seems one connection doesn't seem to fully snap into place. I was hooping with it and it fell apart at that spot. Although when I got the hoop from the mail, it was really cold. I'm not sure if the cold effected the tubing (expanded it or contracted it?) and maybe that is why it wouldn't snap in place. I just get some gaffer and have gaffer over all the connections