You are right, the 900 is the "2010 version" while the 880 is the "2009 version".
Here is the description: (900) Employs new materials to enhance the impact resistance at both the front panel and body protector shield.
In addition, the honor will be distributed to the innovative structure of multiple surfaces and it impact on the contoured body block
Shoulder frame structure is adopted a new triple-blind lost, both the mobility and defensive, rear-band
Also enhanced the installation. It also can be used instead of metal parts to rust is not used at all.
All products are stuck to the installation of the defensive.
And the shoes:
Referee shoes
Brand Esuesukei
Price 13,650 (tax included) (168 CAD, 163 USD)
● referee shoes
● Target
Men's Unisex
● Material
Party member / artificial leather, wood bottom / outsole, plastic (rubber) midsole, synthetic resins (EVA)
● Size
24.5 ~ 29.0cm
● Color
Black × Black
● Specifications
Toe, instep portion, the reinforcing inner part
Central League referee adopted the model
● 2006SSK BASEBALL
Made in China