AME Cribbing Blocks are Certified and Tested • Multiple Sizes and Shapes • Interlocking or Aggressive Non-Slip Surface • Non-Conducting Plastic Resists Oil and Most Chemicals • Does Not Splinter Like Wood • Made From 100% Recycled Plastic • Industrial Cribbing Block Set With Jack Plate • Includes: (12) 15230 Cribbing Blocks Lanyard Colour Blue and (1) 14466 Jack Plate