Oropharyngeal Airways Three different sized and sealed oropharyngeal airways, of the Guedel type, consisting of a curved sterile plastic tube. Two of them were made by Pennin in 1993, featuring green (size two) and red (size four) bite-blocks, and the other has an orange bite-block, made by Vincent Medasil. The item was found inside MIMM/2013-2-3, but it was removed as not part of the original set. 1950-1999