5 Pcs Purple Presta Valve Caps for Bicycle - Dust Proof Bike Tire Stem Covers Compatible with MTB, Fixie, Road Bikes - Perfect Cycling Accessories for Tires & Tubes (Great for Commuting, Mountain Biking & Road Cycling)

This are poorly designed. They do not screw on all the way and therefore you will get dirt in your valve. See pics (gold is correct, purple is wrong). I paid $2 more to get these thinking they would be better quality but they are junk. They do look nice if you don’t care about performance. Sice they only screw down with one full rotation if you don’t make them real tight they will fall off.