I presnet to you a necessity for every cat!  A right parade up to the windowsill, to your bed, to the sofa. Slim design allows these to be placed anywhere you want to help your cat access and they wont take up a lot of space. Its a win win sitaution. 
Puurfect for disabled cats, old cats , kittens , or for access purpouses.
 
Easy self assembly no additional tools required. One person job
 
Measurments:
Base: 55cm x18cm
Step size: 14cmx14cm
Height of:
1st step: 21cm 
2nd step: 26cm
3rd step: 31cm
4th step: 36cm