Aviation Chock with innovative reflex- when safety must not be forgotten. The Mark SP Chock is designed for smaller aircraft, trucks 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 SP takes more wheel force than conventional rubber blocks. To increase the product's user-friendliness a rope runs through the product which creates a handle. Thanks to the shape of the block in combination with the handle, it is easy to place at the right place. The material is 100% recyclable.