Amazon: copper roller bit
Reinsman 776 All Around Curb Bit for Horse - 3-Piece Sweet Iron Snaffle with Copper Roller - Stage C, 7" Cheeks, 5" Mouth7/16" 3-Piece Snaffle w Roller. 4.4 out of 5 stars 20. $94.99 $ 94. 99. FREE Shipping by Amazon. Western SS Copper Roller Snaffle D-Ring Bit. 4.1 out of 5 stars 13.