This is a 4 piece US standard hex "Ball" wrench set from RD Logics. Included in the set are 0.05", 1/16", 5/64" and 3/32" hex wrenches with color coded, anodized high grip handles. The tips of these wrenches are replaceable, so if you break a tip you can just buy a new tip and not an entire replacement tool. These are also nice because they have long shafts on them, making them great for accessing hard to reach places (like the grub screw for retaining the tuned pipe on 1/8th scale buggies!).
Note: The 0.05" and 1/16" wrenches included in this set are not a ball tip wrenches, but a regular standard tip wrenches.