Are they made out of silicon?

Yes a silicone foam, love these grips, best foam type grips out there.

Do these have locking end caps?

No. They just have end cap plugs.

Would these work on my Bontrager alloy, 31.8mm comfort sweep handle bars?

I have the ESI grips mounted on 31.8 carbon bars . They should fit on your bars, they are difficult to put on use a soapy water solution to help slide them on.

Is it easy to switch these grips from one handle to another?

Yes- I slip 4 long allen wrenches with rounded ends in between the grip and the handlebar and the grip slips off. To reinstall I use golf grip solvent.

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Description

🚵‍♂️ Grip the trail, ditch the fatigue!

FATIGUE FIGHTER - Soft silicone material absorbs vibrations, reducing hand strain on long rides.
CUSTOM FIT FREEDOM - Cut-to-length design lets you tailor grips perfectly to your handlebar style.
PRO TESTED DURABILITY - Trusted by mountain bike pros, built to withstand rugged trail conditions.
ULTIMATE TRAIL COMFORT - Extra chunky 34mm diameter cushions every bump for all-day ride ease.
EFFORTLESS INSTALLATION - Slip-on design means no glue or clamps—get riding faster and hassle-free.

The ESI Grips Extra Chunky MTB grips are premium silicone handlebar grips designed for mountain and e-bike riders seeking superior comfort and control. Featuring a thick 34mm diameter for shock absorption, lightweight 80g construction, and a customizable length, these grips reduce hand fatigue and vibration. Easy to install without adhesives, they are trusted by professionals and perfect for riders of all skill levels.

Specifications

Vehicle Service Type	Bicycle
Color	Black
Brand	ESI Grips
Material	Silicone
Product Dimensions	5.13"L x 1.33"W
Item Weight	80 Grams
League	ESI
Global Trade Identification Number	00181517000544
Number of Items	1
Manufacturer	ESI Grips
UPC	181517000544
Item Package Dimensions L x W x H	7.05 x 1.65 x 1.34 inches
Package Weight	0.09 Kilograms
Item Dimensions LxWxH	9 x 4 x 2 inches
Brand Name	ESI Grips
Warranty Description	Limited Manufacturer
Model Name	ESI Grips 91-0495K
Suggested Users	unisex
Part Number	91-0495K
Model Year	2014
Style	Extra Chunky
Included Components	ESI Extra Chunky MTB Grip, Black
Outer Material	aluminum
Size	One Size
Sport Type	biking
Skill Level	All
Grip Type	No

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