Cheek Pad Set for the GT-Air, 31mm. The number on the cheek pad is the thickness in millimeters. Thinner pads can be applied to loosen the fit, thicker pads can be applied to tighten the fit. All sizes of cheek pads will fit any size GT-Air.
Stock sizes are as follows:
XS = 39mm
S, M, L, XL = 35mm
XXL = 31mm