There are a variety of grammages available provided that the quantity is there. Below is a list of various products available:

210gsm Green Lined Kraft
220gsm Double PE Coated Board
280gsm Planche Kraft
400gsm Planche Kraft

These are only available in sheeted form due to material being susceptible to curling. Standard sizes are 1000mm x 1200mm and 800mm x 1200mm

SomerUnion Krafts

More commonly known as Kraft Union or bitumastic papers, this product is used in the lining of pallets for transit and storage as well as lining export packing cases. These can be reinforced both one way and two way and come in a variety of grammages.

120gsm Kraft Union
165gsm Kraft Union
210gsm Kraft Union
145gsm 2 Way RF Kraft Union
165gsm 1 Way RF Kraft Union
170gsm 2 Way RF Kraft Union
188gsm 2 Way RF Kraft Union

Sheet sizes can be made to required size but the more common sizes are 1200mm x 1000mm and 1200mm x 800mm. These are the sizes for both standard and euro sized pallets.

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SomerMelt

These are papers used in packing where a bitumen lamination is not welcome. It is used in a variety of purposes. It has been know to be used a floor mat in cars, lining of pallets, targets in archery and as a reinforced wrapper. It can be supplied with or without reinforcement and is available in 1 way and 2 way reinforcement.
SomerMelt S100 (100gsm Brown Unreinforced)
SomerMelt R110 (110gsm Brown 1 Way Reinforced)
SomerMelt R110 (110gsm Brown 2 Way Reinforced)
SomerMelt R150 (150gsm Bleached 2 Way Reinforced)
SomerMelt R175 (175gsm Brown 1 Way Reinforced