Some burms develop respiratory problems from the dust produced by wood particulate-types of beddings; just something to watch out for. Cypress mulch usually has large splintery pieces and if ingested, can be fatal, or, at the very least, produce a very expensive vet bill. Two very safe beddings are CareFresh (a recycled paper product), or, my preference, good old fashioned newspaper; still the best bedding. I use aged black and white sections and have been keeping my "home" snakes on paper for over 30 years (the herps at my wildlife center have natural substrata for public exhibit purposes but I still like newspaper best).
Rob Carmichael, Curator
The Wildlife Discovery Center
Lake Forest, IL