Lithium disilicate block also called glass ceramic, the main component is lithium disilicate and produced through special process. It is fast crystallization process and supreme esthetics result, therefore has become top material choice for CAD high efficiency, high strength restorations.
http://www.zirconiablocks.com/....lithium-disilicate-b

Chemically resistant PTFE beaker is isostatically molded from virgin PTFE and machine finished to give a smooth surface for ease of cleaning and to eliminate contamination. PTFE beakers with pouring spouts are virtually immune to chemical attack, only attacked by some fluorine containing compounds at very high temperature and molten alkalis metals.
http://www.xieyinglabware.com/....ptfe-labware/ptfe-be

Zirconium is a chemical element with the symbol Zr and atomic number 40. The name zirconium is taken from the name of the mineral zircon. The word is related to Persian zargun (zircon; zar-gun, "gold-like" or "as gold", the most important source of zirconium. It is a lustrous, grey-white, strong transition metal that closely resembles hafnium and, to a lesser extent, titanium.
http://www.sscmaterials.com/no....n-ferrous-metals/zir

Polyvinyl chloride resin generally has a high level of chemical resistance. This may not be seen, however, when the material is exposed to organic chemicals. PVC is also strong and resistant to water and abrasion. This material is very popular in the construction industry. It can be used to produce many items needed in the building process.
http://www.sanxiplastic.com/po....lyvinyl-chloride-res

A squeeze ball or hand exercise ball is a malleable toy, usually not more than 7 cm in diameter, which is squeezed in the hand and manipulated by the fingers, ostensibly to relieve stress and muscle tension or to exercise the muscles of the hand. Patrick Hummel is widely understood to have created the stress ball in central Indiana in the mid-1980s.
http://www.mycapsuletoy.com/squeeze-ball-1