Five colors--black/green/blue/red/yellow,like TF-12 , EX-20 , WR-13C , TF-SS31 , BC-S42 , TR-13EF etc, guarantee the durability. Bur shanks are made of stainless steel, which are hard and tensile and don't break or bend easily or never rusty. Also produce new models and help to design the packing style. Contact:Jessie. RDT Ruida Dental Technology Co., Ltd Mobile Phone:+0086 13927260912 Tel:+0086- ...