BERNINA Universal Sewing Machine Needles 130/705H Size 100/16

Standard every day sewing machine needles for all them household jobs

Size 100/16 are standard/heavy weight sewing machine needles

They have the standard domestic needle fitting having one flat side at the shank (Top) of the needle and manufactured with a standard round point which allows this needle type to sew most general fabrics and materials. 

The size you require is basically dependant on the weight or material thickness.

For fine, thin materials use a thinner needle and for thicker, heavy materials use a thicker, wider needle.