These are all 16 lb, used, but very good to excellent condition, single drill balls.
All with finger and thumb inserts, approx. 4 3/4" span (4 1/2" cut to cut), right handed. None have weight holes.
All of them have no tracks.  Most are in their original boxes, as I am the original owner. Almost all have the CG below the pin or within 1" of the grip center.

Each is $20 + shipping to the 48 states. PayPal (buyer pays PayPal fees) or money order accepted. They'll be shipped either FEDEX or UPS and double boxed.

1. Brunswick Monster Slayer, 3" pin, in the ring finger hole.
3. Brunswick Red/Black Monster, 2" pin, under and right of ring finger. hole
5. Storm Razor Wire, 2.5" pin, over ring finger hole.
7. Brunswick Power Groove Plum (pearl) Proactive, 3" pin, in the ring finger hole.

SOLD 2. Columbia Sport, 3" pin, next to ring finger hole.
GONE 4. Columbia Surge, 3" pin, in the ring finger hole
GONE 6. Hammer Razor Blade, 3" pin, in the ring finger hole.
SOLD 8. AMF Radar, 3" pin, over the ring finger hole.

Full descriptions can be found
1. http://www.ballreviews.com/?action=ballist&page=ballreviews
2. http://www.bowlingballvault.com/,  or
3. http://www.123bowl.com/default.cfm
or the manufacturers' own web sites.

Pictures:
http://s360.photobucket.com/user/jeffrt42/library/16LB-Used-Bals?sort=3&page=1

ttt