It's about as heavy as a Billiard Ball.
In other words, the weight of a Billiard Ball is 1.0454545454546 times 0.000171875 tons.(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 0.000171875 tons and 0.0001875 tons. According to legend, the difficulty in obtaining elephant ivory for the manufacture of billiard balls in the 19th century inspired the search for a replacement material, which led to the development of the first industrial plastic.
It's about as heavy as a Puck (Hockey).
It's about one-and-one-tenth times as heavy as a Baseball.
In other words, 0.000171875 tons is 1.0731707317073 times the weight of a Baseball, and the weight of a Baseball is 0.93181818181820 times that amount.(MLB rules)
Per Major League Baseball rules, a baseball must weigh between 0.00015625 tons and 0.0001640625 tons. A major league pitcher can throw a baseball at up to 150 kph (91 mph) (with a fastball pitch), with record-setting pitches as fast as 171 kph (106 mph).
It's about one-and-one-fifth times as heavy as a Battery (D).
In other words, 0.000171875 tons is 1.150 times the weight of a Battery (D), and the weight of a Battery (D) is 0.870 times that amount.(Alkaline)
A "D" size battery weighs 0.000149 tons. The D size battery is the oldest of the modern battery sizes, first invented by the National Carbon Company in 1898.
It's about four-fifths as heavy as a Hamster.
In other words, the weight of a Hamster is 1 times 0.000171875 tons.(for Syrian hamster, a.k.a. golden hamster, a.k.a. Mesocricetus auratus; adult)
An adult Syrian hamster has a typical weight of about 0.0002 tons. Known for transporting food in the pouches of their cheeks so that they can bury it later, some hamsters can store up to 0.03 tons of food in their borrows.
It's about one-and-seven-tenths times as heavy as a Deck of Cards.
In other words, the weight of a Deck of Cards is 0.590 times 0.000171875 tons.(ISO 216 B8 size, a.k.a. "poker size" 63 x 88 mm, 52-card deck)
A deck of 52 ISO 216 B8-size playing cards weighs 0.0001 tons. Utilizing nearly 3,700 decks, the record-holding largest card tower was built in early 2010, stood over 3.5 m (11 ft), and weighed over 0.250 tons.