Ringal or Dwarf bamboo is very flexible in nature, available in local forests of Uttarakhand. Bamboo craft is practiced in many places of Uttarakhand due to abundant availability of rich quality and variety of species of bamboo in local forest. Among the species of bamboo Ringal is one of the bamboo species. Local bamboo artisans' make varieties of house hold bamboo products with tender bamboo splits. These products are very strong and suitable for multipurpose uses. Containers, storages, mats, baskets, winnows (sieve used when the crop is harvested to clear impurities in grains) are made to cater local needs.

The common household kitchen product 'Sieve' or 'winnow', is mainly used for agricultural and kitchen purposes. Lengthy bamboo pole is split into wide thin splits. Slightly tender bamboo splits are directly used for winnow weaving. In case if the bamboo splits are dried, they are soaked in water before weaving to regain moisture. Winnow weaving process is done by arranging the bamboo strips in criss-cross manner with the help of small bamboo stick. Once the weaving is completed, the extra edges are cut and removed. A small tender stick is tied on the edge of the winnow to give reinforcement.

For more details:
http://dsource.in/resource/ringal-bamboo-basketry-uttarakhand