Our budget sleeves are plain non-fray nylon netting tubes seamed down one edge. 
 
These versatile sleeves can simply pulled over a tree branch, shrub or other plant.  When fastened at top and bottom with a tie cord, strap, or elastic (not supplied), the sleeves provide a secure environment for insect study.
 
Our budget sleeves are supplied at 1.5m (59") long and will be provided untrimmed (with the material selvedge at each end).  They can be cut using ordinary domestic scissors to the required length. A great way of getting multiple sleeves at low-cost.  
 
20cm (8”):  63cm (25”) circumference, 20cm (8”) circular diameter
30cm (12”): 96cm (38") circumference, 30cm (12") circular diameter
40cm (16”): 1.3m (51") circumference, 40cm (16") circular diameter
60cm (24"): 1.9m (75") circumference, 60cm (24") circular diameter