These are the new Dal super strong Prop 5x4.5" high RPM props (Oct 2015) 0545 -   These are well matched to 2400kv CarbonBird motors on 4S on Scarab 270 Air Knife-mini for extreme speed fast flying FPV or racing.  amazingly -  They require almost NO balancing - They are tough and quite.  

How do they compare?  there is no agreement on props - each pilot will have his own prop story - but Sometimes its annoying to have to do a prop change everytime you have a small incident with a racegate, a hidden branch of a tree or the ground that follows - these props will ensure the "incident"  wont have walking back for tools -  they are ideal for those days when you are exploring, pushing thru leaves and trying new stunts. 

Why are the tips NOT tapered down? Blunt nose/ Bull nose?   This type of hack produces more tip trust at the expense of efficiency - so you get "pop" but lose flight time from the bigger tip vortex - the other reason pilots like bull nose tips is they dont normally shatter as easily on impact with the ground - but overall its strength issue rather than an aerodynamic masterpiece ( a well-designed prop is always tapered to the tip)

Features

1. SUPER Strong - this type plastic has a memory - if bent will stay bent - be carefull not to fly without straightening them first - poor tracking (vertical offset) can cause IMU issues
2. Super light weight 3.8grams/ prop - perfect for rapid speed changes 
3. 5mm ID bore  
4. Requires 7.2mm shaft height ; 5mm diameter shaft to mount it.
5. These are high quality props for a great low price - but you must adhere to safety warnings about props below - always.
6. require almost NO balancing (always check every prop and use 800 grit wet-n-dry to remove any sharp edges at the leading edge of the blades)

Includes

• 4 Rev3 DALprops 5x4.5" 0545 as you see in Photo 1 at right - RED - 2 CW(R) and 2 CCW

Excludes