An important use is for stuffing the nose which makes embroidering much easier. Polyester is the most common filling available and is extremely easy to use. There are many different grades and qualities. Kapok is a material that is very silky to touch, but as it is handled, the fine fibers float around, so wear a dust mask. Kapok is best used for small and miniature bears since it gives a 'weighty' feel as it is packed in.
Pellets are available in plain and scented varieties.
Glass beads are easy to use. Glass beads are recommended over steel shot due to health reasons. Since they are washable, they are excellent for teddy bears made for small children. You can't make fine adjustments on joints with a flange system. Screw joints are easy to install and can be fine-tuned.