The Farrier's Pride Bar Wedge Pad are very tough and are manufactured from top of the line polyurethane.

WB-3 - 1/4'' thick at heel, 4 1/2'' long, 5 5/8'' wide.
WB-4.5 - 3/8'' thick at heel, 4 1/2'' long, 5 5/8'' wide.
WB-6 - 1/2'' thick at heel, 4 1/2'' long, 5 5/8'' wide.