The picture shows the r8000 pulley wheels (one wheel has bigger teeth). how do i know i'll be sent the 6800 pulley wheels? there's no way to select.

The pair I received were both for 6800. They came in a Shimano sealed package.

Would these work for Ultegra 6700 10 speed?

Nope, only 11 speed. There are specific ones for the 10 speed and if you use an 11 speed pulley on a 10 speed drive chain, the pulleys will wear more quickly due to slight differences between the 10 and 11 speed drive train.

Mounting Type	Braze-On Mount
Number of Teeth	13
Manufacturer	Shimano
UPC	689228847736
Global Trade Identification Number	00689228847736
Item Package Dimensions L x W x H	3.7 x 2.6 x 0.94 inches
Package Weight	0.03 Kilograms
Item Dimensions LxWxH	5.25 x 3.5 x 0.25 inches
Brand Name	SHIMANO
Model Name	Ultegra 6800 11-speed Rear Derailleur Pulley Set
Suggested Users	unisex-adult
Number of Items	1
Part Number	Y5YC98140
Size	Ultegra RD-6800
Sport Type	Cycling

Ultegra 11 Speed Road Pulley Wheel Kit

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