I normal carry some spare mtb grips in my stock pile but when I was building the Krampgrease there was none left. At the time Westbrook Cycles was having their clearance sale and these were on offer with 75% off, i was going to buy them anyway as when i sell mtbs i never have any spare cheapo grips to put on. They landed the next day and fitted them with no problems, nice and tight so should not slide off or rotate under use. They are light but looked alittle thin. After a couple weeks of use they have come off and thicker grips fitted. I was suffering from palm pain after an hour+ use which is no good what so ever. They have gone back into the stock pile tub for the next mtb i sell. Cannot crumble really at £2.99 pair ! Official info At nearly half the weight of the RXL, the ontrager Race XXX Lite Foam Grips take minimalism to a whole new level. Constructed from special super-light EVA foam, this 15g grip is molded for a comfortable and ergonomic grip, letting you shed weight without sacrificing hand comfort.