Tie tacks

A tie tack wherein at least one surface adapted to be in contact with a tie is covered at least in part with a layer of non-staining depressible polymeric plastic polyurethane foam material, said layer of depressible polymeric plastic polyurethane foam material ranging in thickness from about 1/32 inch to about 1/8 inch, thick enough to engage the tie when in service to prevent rotation of exposed parts of a tie tack and thin enough to avoid interference with the normal functioning of the tie tack.