Magni SC (Stop Collar) can be used to firmly hold buoyancy elements in position axially on a riser joint, to prevent the buoyancy from sliding along the tube of the riser when it is in an up-right position. 

Magni SC has an internal profile and can be positioned within the profile of the buoyancy elements or riser protection  modules, without increasing the external profile and ensuring they are not exposed. 

Designed to fit around any diameter riser joint main tube with a customizable design, Magni SC can be used with Magni DRBM (Drill Riser Buoyancy Modules) or Magni RG (Riser Guard) protection.