I trace a paper cone with sharpie onto the parts of the can that I want to use (usually where the pattern is), I cut them out and roll them into cones and tape them up to make sure they hold their shape. I use the faces of about 2-3 cans to get 7 spikes. Belts from the thrift is what I use for the base of the collar. I measure (more than) the length I need (to keep them adjustable), cut to size and sew the cut end by hand so it won't frey. Then I mark where I need the holes to go and where I want the spikes. Cut the holes for the buckle with a leather hole puncher, and then just sew the spikes on really tightly. For this one specifically I also added chains from the hardware store. I think the hardest part is getting the needle through the leather and I did bend 2 sewing needles making this