crazy rubber, you'd better use it after filling it, otherwise the elasticity will be poor and hard! Especially the general madness! Butterfly can do both forehand and backhand, depending on your habits! Personally, I feel that the forehand is still a slightly hard sponge+sticky rubber, and the soft sponge is astringent. Most coats are suitable! The quality control of the bottom plate is slightly different, and so is Stika (compared with the licensed European version of water, Japanese version of water, etc.). According to personal touch, there are sometimes differences! I don't know if your teammate's crazy speed is the same as yours. (Crazy rubber, new and old models also have quality control problems, which may be divided into provincial madness and national madness later, so the general madness performance has declined, and there are more fakes! And the rubber cover he used or the sponge and rubber he gave himself? Is the hard rubber of rubber cover the same? ...)