Thanks for your answers. Now, I worked the chart out. The I.D. of my canister shells is 1,1-inch (28 mm). So 3,4 mm to 4 mm colored stars would be the best choice. I made a test with cut stars about in this size and the burn time and density was perfect. Thanks.

This is my new star roller from http://http://pyro-g...o.uk/Shop2.html, I bought on July 2014.
So, I will try to roll my compositon on mustard seed.
