そだよ

There are two main types, "madake" (the most expensive) and keichiku (the most common). Andy Fisher sensei wrote about this, I'll copy here his post, hope it helps! From Andy Fisher Facebook page: Kendo Trivia : Shinai. Did you know that there are different types of bamboo that are used for Shinai? The two main categories are 'Madake' and 'Keichiku'. They refer to the specific species of the plant used to make the Shinai. Madake is the species of bamboo that is native to Japan. Whereas Keichiku is the native bamboo of Taiwan. Although it is the Japanese indigenous species of bamboo, a Shinai that is Madake is necessarily made in Japan. The Japanes species is now grown in China too, so many Madake Shinai are made in China. Further, even if the Shinai is advertised as using 'genuine' Japanese-grown Madake, often the raw bamboo is shipped in bulk to China, where it is made into Shinai. This doesn't really reflect on the quality however, as these days, the ability of many Chinese Shinai craftsmen have surpassed their Japanese counterparts. Madake is produced in a far lower volume than Keichiku, so Madake tends to be more expensive. Many associate this to mean that it is stronger, lasts longer or is in some other way better. It tends not to be the case though. To my knowledge no studies have been carried out on the topic, but in my own personal experience, the strength and durability of Madake and Keichiku tends to be roughly the same, given the same environment. So what is the difference? Well, the fibres of Madake bamboo are tighter packed than with Keichiku. So in essence, the material itself is a little more dense. This means that it takes longer to soak up oil than a Keichiku Shinai would, but at the same time it retains it longer, so it won't dry out as quickly. This is good for those in dryer climates, as it can help with durability. This density also makes the bamboo more rigid, so Madake Shinai tend to have a 'firm' fell when striking, compared to Keichiku Shinai which can feel more elastic. If climate isn't an issue, then it comes down mainly to personal preference. If you prefer a rigid feel from your Shinai when making strikes, then Madake is a great choice. If - like me - you prefer a more elastic feel, then Keichiku could be a more appropriate option.

Well I think the thick layered ones

swift hands o.o