Are simply clamped between the cooling fins and thus reduce the noise emission
Fit cylinder and cylinder head, originally standard on SR/TT/XT500, also fit many other air-cooled YAMAHA 4T models (SRX400, SRX600, XT400, XT600ZS, XT350, SR250, SR400, TT250, TT350, TT600)
Highly heat-resistant, price per 6-bar (up to four bars are required)