Sold INDIVIDUALLY, you get one with each order. 

RF8081R

Large SHOCK Red
Red lightweight sheaveless block, suits 10mm (3/8") Line
FEATURES
Performance & versatility.
Ultra lightweight.
Ultra compact.
Durable.
Color coded.
Impact resistant.
Small line optimized.
High load capacity.
Soft attachment compatible

Specifications
Product Specifications
Rope Ø (in)    1/8-3/8
B.L. (lb)    2200
Weight (oz)    0.42
Width (in)    1
Length (in)    1 7/16
Height (in)    9/16
Gear ratio 1st speed    2.8:1
Gear ratio 2nd speed    8.8:1
Power ratio 1st speed    15.7:1
Power ratio 2nd speed    49.3:1