I use the curved pins. I think they're one inch. Got mine when they were 50% off. You might be able to use a JoAnn's coupon. You need to pin so there's no more than 4-5 inches between pins. Number of pins needed depends on how large the quilt is. That being said, I mostly spray baste now. It's much quicker and holds the sandwich together better. Also, no pins in the way when you're quilting.