The Red and White bangles worn by the married woman of Bengal are known as Shankh Pola Bangles. The white ones are made of Shankh meaning Conch shell and the red ones I think are of lac. Some say white bangles are made of Ivory. But I think that would have been in the past as these days, there is a ban on ivory and it is costly too. Moreover Shankh means Conch shell.
Here is a glimpse:
This goes well with their traditional white/off white and red sari. I always have a pair of these saris. I love the combination.
These bangles were offered to goddess Kali in Kolkata and after performing Pooja there they were blessed and given to me by my friend. The yellow stains you see on the white bangles is that of turmeric. I always wanted to own one pair of these bangles and now my wish is fulfilled :)......
Keep an eye on my blog......
UPDATE 2-8-2014:
Friends one of the visitors, Ananya has given the link where you can buy these bangles. Here it is:
http://sonababu.com/
Visit the site and see for yourself. I have provided this as update here so that those who visit this post may not miss it. My thanks to Ananya for taking time to leave the message.
Hope you will visit the site. I am also planning to buy some.