It's safe on all surfaces

Sweat Cover for Smartphone: This convenient cover protects your bike from sweat while giving you access to your smartphone while you ride

Product description The micro-sized pump and integrated CO2 inflator lets you choose between pumping or inflating with CO2

Also compatible with Campagnolo 13-speed chain

Shimano 105-5700 2 X 10-Speed Clamp Mount Front Derailleur Sunshine_Enriched It's safe on all surfacesWide pivot link design and a reprofiled chain guide suppresses flex for smooth, precise shifts with improved cross chain clearance Braze on fits frames with pre existing front derailleur braze on (can also be used with 31. 8mm or 34. 9mm braze on band clamp adapters), or use pre sized band clamp versions 95g (braze on) Wide pivot link design and a reprofiled chain guide suppresses flex for smooth, precise shifts with improved cross chain clearance