Clover Stitch Markers are great for marking the beginning and ending of pattern stitches, as well as where to increase or decrease the number of stitches.  These markers have a specific triangle shape that allows the knitting needle tips to slip in easily when passing the markers from one needle to another. 

Extra Small #3148 package has 24 pieces. Fits Knitting Needles #0 to 4.

Small #3149 package has 16 pieces. Fits Knitting Needles #5 to 8.

Medium #3150 package has 16 pieces. Fits Knitting Needles #9 to !0.5.