Available in  02 Sizes [Outer Diameter (X) * Inner Diameter (Y)* Thickness (Z) {in mm}] ~ Medium = [140 X 60 X 45] and; Large = [200 X 100 X 60]  in both green/ blue color options. 
Support's patient's head during surgery allow access to intubation due to its contoured structures.
No pressure on eyes especially in prone position due to ergonomic design and elastomeric gel technology.