This can be answered in two ways. While the timbers may seem to have a high initial price per piece, their durability and ease of installation make them much closer in cost to wood borders. When you consider the other advantages of SLRT; no splinters, no need to paint or seal, rounded top for safety, free of all harmful chemicals, weed eaters will not damage them, 10-year warranty and once again the ease of installation {malleable, recessed pre-drilled holes, interlocking ends}, when you factor in all of the advantages of SLRT it really is your families best choice.