COMPATIBILITY: Fits ø35~48mm stems or ø25.4~34.9mm tubes. Compatible with: GARMIN® EDGE, WAHOO®, SIGMA® ROX cycle computers, and GARMIN® VARIA rear radar Material: Engineering grade polymer Size: 4.2 x 3.7 x 1.7 cm Weight: 21.4 ~ 23.8 g (depending on base and spacer selection)