Aviation Chock with innovative reflex- when safety must not be forgotten. When you want even better grip on the ground, Mark friction is a must, the same light Aircraft shock as before, Mark II Chock is designed for large aircraft, e.g. Boing 737 or Airbuss A320, and aviation equipment. The product is made of very durable, lightweight polyurethane. The material is resistant to extreme weather conditions, oils, propellants, as well as a high tear and abrasion resistance. Thanks to the material properties, the block will never rot, crack or splint. Tests have shown that Mark II Chock takes more wheel force than conventional rubber blocks. A reflex is placed on eatch side of the outermost part of the chock in order to further visualize the block if it would be placed behind a wheel. Thanks to the shape of the block, it is easy to place at the right place. The material is 100% recyclable.