Light-weight Solid Structure With PMI Foam. 

PMI supplier ROHACELL(www.rohacell.com) is same as brand, Mavic,Corima.                                 

Solid rims are different,the core of the rims is structured with stiff foam. It can effectively deter the distortion of the rim, let the padding power directly on the tire. Of cource, the spokes must be properly tensioned.       

The weight is only about three quarters of the normal rims. With the good inertia effect, they also keep the outstanding acceleration feature of the light-weight and low-depth.