Topeak SmartGauge D2 Advance As the eyewear of choice

As the eyewear of choice for world champion cyclist Peter Sagan

Direct attachment (Conventional) Yes

and is now better than ever with 4C Graphene compound technology

Material: steel

They also increase your performance

Topeak SmartGauge D2 Advance As the eyewear of choiceThe second generation digital gauge features a rotating SmartHead and works seamlessly with Presta and Schrader valves without changing parts. Precision digital gauge reads up to 250 psi 17 bar and is designed for use with tires, suspension forks and rear shock units. LCD display can be programmed to show pressure in psi, Bar, or kg cm2. Specifications HEAD SmartHead, Fits Presta Schrader valves GAUGE Digital PSI, Bar, kg cm2 BATTERY CR2032 x 1