OPRO Self-Fit UFC Gold Mouthguard Black Metal / Gold We’ll leave the real guard positions to you while we stand back and look after your teeth from the sidelines with the UFC Gold mouthguard. This competition-level mouthguard comes in two bold colours of either black or red, letting you reflect your courage and boldness- whether you are in the ring, the octagon, or the pitch. Adult sizes for 11+, youth sizes for ages up to 10.