I have a set of Gossamer Gear LT4 trekking poles (no straps) for sale. Asking $125 Shipped to Continental USA. Payment by Paypal. I can ship internationally at actual shipping rate by US Post Office. GG retail price is $175 + shipping.
http://gossamergear.com/trekking/trekking/lt4-trekking-poles-all.html

These poles are in excellent working condition and excellent cosmetic condition. The O rings are intact. The lower shafts function perfectly and stay in place when tightenened. However, one of the tips is missing. Gossamer Gear sells replacement tips, a set of 2 tips is $7.50 + shipping.
http://gossamergear.com/trekking/trekking-accessories/trekking-pole-tip-9-6mm.html
The online manual for LT4's states
Repair/Replacement
We now sell replacement parts and pole sections online. We also offer single poles for sale as well. Also, should your poles lock up you can send them to us and we will most likely rebuild them for you for the cost of parts and return shipping. We have made some changes to the expander mechanism over time and will upgrade any poles sent to us for the cost of parts and return shipping. Last, should you wear out your trekking pole tips they can be replaced but be aware that they are glued on and will need to be knocked off. The trekking pole tips ARE NOT threaded and trying to “unscrew” them with a pliers etc will cause the carbon fiber to fail. We will also put new tips on your LT4’s for the cost of parts and return shipping. Please send all pole repairs to:
Gossamer Gear
3909 Robert Burns Drive
Austin TX 78749
And be sure to include a note about what needs to be done, who you are and how to reach you.
http://gossamergear.com/wp/wp-content/uploads/2011/08/User_Manual_LT4.pdf

The adjustable feature has numerous benefits: easier to travel on airlines; you can adjust height for use as tarp/tent poles; you can adjust length for trekking up hill vs longer length for downhills.

I bought these on Gear Swap in July 2012.
http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=66003&skip_to_post=564289#564289
I have never used these poles hiking, except walked with them a few times around my mother's golf course condo complex in Florida.
I have 2 sets of Gossomer Gear trekking poles - LT3C (fixed length) and LT4's. I've decided to keep the LT3C's and sell the adjustable LT4's.

Features
•Custom-manufactured carbon fiber for optimum strength to weight ratio
•New Spiral Wrap at the tip section for added durability
•Carbide tip
•Small trekking baskets included
•Small spectra core loop below handle for attaching a "keeper" cord
•Floats, in case you drop it in a stream
Specs Weight
•4.1 oz. (119 g.) per pole
•Trekking baskets add 0.4 oz. (11 g.) each
•Travel Tube is 12.5 oz. (354 g.)
Size
•Adjustable from 90 cm. (35.5 in.) to 140 cm. (55 in.)
•84 cm. (33 in.) completely closed
•upper section: 74 cm. (29 in.)
•lower section: 81 cm. (32 in.)
Travel Tube has a 36 in. (91 cm.) length and a 3 in. (8 cm.) inside diameter
NOTE: Tip section length can vary slightly
Materials
•Custom spec tapered carbon fiber tubing
•EVA "Kork-O-Lon" foam grips
•Carbide tip
•Travel Tube: Heavy-duty industrial grade cardboard
Color
•Matte Black poles
•Tan handles
•Travel Tube: Kraft brown