when we produce bamboo arrow shafts,we have 2 heat process,1 just put them into Ovenjust for get rid of water and make bamboo fibre stiff,another is modern way:carbonation:to make them uniforn spine each part which japan and korean don't use it( or they don't know,or they can't do it,as their way is 1000year ago chinese way,no carbonation stove in that time),pls see our carbonation stove photo we get rid of bamboo skin: 1)to let bamboo become very smooth,so,almost nothing resistance when it fly,and bamboo skin will also refuse varnish absorb,so,it look ugly 2)sand out all skin also make it heating uniform:same spine with all direction for 1 shaft,so,this points is more scientic way than japan or korean bamboo shafts making,yes? 3)without bamboo skin is uniform carbonization ,it looks great class colour ,important is spine uniforn,and this points is may be more advanced skill than japan and korean,i don't see them do bamboo shafts with carbonization process,just heat and make them straighten.and make hole to leave air pass.i consider our process is more scientific and advanced ,but many people don't know it