BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a surface having numerous protrusions.
FIG. 2 shows a non-slip gripping surface consisting of numerous protrusions of a hard material with softer material filling in the voids between them.
FIG. 3 shows a set of two steps having a non-slip gripping surface of the present invention.
FIG. 4 shows a round gripping surface of the present invention.
FIG. 5 shows a cross sectional view of a soft high friction material filling in voids between surface protrusions of a harder material.
FIG. 6 shows a cross sectional view of a soft high friction material filling in voids between surface protrusions of a harder material having flattened tops.
FIG. 7 shows a soft high friction material filling in voids between surface protrusions of a harder material having flattened tops.