Phil Wood & Co. seatpost collars are machined out of solid US-produced billet aluminum. Each collar is machined in-house to the same high-quality standards we apply to all of our products. AVAILABLE COLORS Silver, Black, Red, Blue, Green, Purple, Pink, Gun Metal Gray AVAILABLE SEATPOST DIAMETERS 28.6 mm (44 grams), 30.0 mm (42 grams), 31.8 mm (39 grams), 34.9 mm (34 grams) Please note: Seatpost clamp diameter is the outer diameter of your bicycle frames seat tube. Not your seatpost that your bicycle seat/saddle attaches to.
PLEASE MEASURE THE SEAT TUBE OF YOUR FRAME BEFORE PLACING A ORDER TO INSURE YOU ARE ORDERING THE CORRECT SEATPOST COLLAR NEEDED.