11/0 Glass Seed Beads
Miyuki and Czech Glass Seed Beads are considered top quality when we are talking about seed beads. They come in beautiful, vibrant colours, they have the most consistent sized inner hole that I know of, and a very consistent shape.
I retail size 11 rounded transparent beads in 2g, 5g and 10g size.
You will need a smaller than normal needle to get through the hole, you can use a beading needle or fine sewing needle, both work just fine!
To give you an idea:
2g jar = 1/2 tsp beads (this is about 400 beads)
5g jar = 1 tsp beads
10g jar = 1 Tbsp beads