The staysail is self-tacking and the jib has roller furling. The jib is roller furling and the bow is equipped with a spinnaker launcher. The jib can be fitted with a roller furling system. The other common type of furling system is for the mainsail. This is usually combined with a jib furling system. Some booms allow for roller furling of mainsails. Mast furling systems essentially eliminate the possibility of battens, as vertical battens are not practical. Roller furling is typically used for foresails such as jibs or genoas. Boom furling mainsails also must deal with the issue of the leading edge. The simplest and most common furling systems are for jibs and other headsails. Tacking with a screecher may require furling and re-setting. Mast furling systems avoid the issues of boom furling, but add their own issues. The furling booms were built in Valencia by Future Fibres. By the 1940s nearly every British cruising yacht was fitted with this furling system. There are quite a few variations of in-boom furling available.