– Color: Red- Inner diameter: (Prop Mount) 5mm- 6040 High Efficiency, Good Balanced Props- 4 Props total (2CW, 2CCW)These are perfect for beginner mini quad flyers. These provide just the right amount of power and are not intimidating.PC + glass fiber material is made of a high quality, flexible and durable plastic that can easily survive crashes and tree clips.They are NOT Indestructible, but they are durable.