Savinelli's balsa filters provide a drier smoke by the simplest of means: absorbing moisture and condensation, along with impurities, from the smoke-stream. While many more complicated systems have come and gone, Savinelli's remains, and remains popular, being both effective and very inexpensive. The balsa filters are sold in a box of 50 pieces. Length: 1.35 in. Height: 0.34 in. 9mm.